SD (Secure Digital) cards are a special brand of data storage that have two main purposes, to store data and to transfer data between devices. SD cards are popular in devices that are too small to have dedicated hard drive storage space, such as mobile phones, GPS units, digital cameras and many other electronic devices. Data that is stored on SD cards can be read by all these electronic devices, and can also be read by PCs and laptops that have card adapters. This makes transferring data between mobile devices or digital cameras and laptops/PC simple and convenient, and users won't have to worry about losing their data.

1. Basic Variations

SD cards started out simply as SD cards, but as the technology has expanded so has the range and choice of SD cards. Some SD cards may not be compatible with certain devices, both in terms of size and the format of data storage used on the SD card. Knowing which card to buy can be intimidating, but in general there are only three considerations that should be kept in mind when looking for an SD card: the physical size of the card, the storage space and format of the card and the class rating of the card.

2. SD Card Sizes

SD cards come in three physical sizes: SD, miniSD and microSD. Normal SD cards are the largest, miniSD cards are smaller and finally, microSD cards are the smallest, being the approximate size of a fingernail. The physical size of the card doesn't affect the capacity and storage space of the SD card, with microSD cards being able to store up to 32GB or even 64GB of data. SD cards are larger than microSD cards.

2a. Size in Conjunction with Usability

SD card sizes become an issue when examining which devices they will be used in conjunction with. MiniSD cards have mostly fallen out of favour, and apart from older devices and some digital cameras, miniSD cards are not used anymore. Full-sized SD cards are usually found in use with digital cameras, laptops, and desktops. The smallest cards, microSD cards have found massive popularity as the cards of choice for mobile phones and many of the latest electronic devices. Luckily, for those concerned about incompatibility and the inability to use the same microSD card to transfer data between their mobile device and their laptop or PC, many microSD cards come with adapters which turn the tiny card into a normal-sized SD card, which can then be used in conjunction with a laptop or PC.

3. SD, SDHC, and SDXC

Apart from physical size, another consideration when choosing a SD card is the storage space of the card. SD cards have come a long way in terms of storage space, with cards that can store up to 64GB or larger being available.

SD Cards

SD cards were the first cards on the market, and can only store up to 2GB of data. It should be noted that microSD cards that have the same format can also store only 2GB of data, as physical size doesn't have an impact on the amount of storage space.

SDHC Cards

2GB is a tiny amount of data storage, which is why the developers and manufacturers of SD cards came up with an additional storage format known as SDHC, which stands for Secure Digital High Capacity. These cards can store between 4GB and 32GB, but can only be used in devices compatible with the SDHC format. The SDHC format is also reverse compatible, meaning that devices that can read SDHC cards can also read SD cards, but devices that can only read SD formats cannot use cards that have the SDHC format.

SDXC Cards

SDXC (Secure Digital eXtended Capacity) cards are the latest SD cards available and their storage sizes range between 64GB and 2TB. There are very few devices at the moment that can use SDXC, but these will most likely increase in popularity as data needs of users increase even more. Knowing how much space is needed can be a tricky thing, as it's difficult to predict in advance how the device will be used and the type of data that will be stored. Below is a chart showing average values that can help give an idea of how much data certain media applications can use. It should be noted that these are estimates only, as file sizes can dramatically vary depending on the settings used.

4. Class Rating

Apart from card size and storage space, there is a further important difference to take into consideration when choosing a microSD card, and that is the class rating. Simply put, some microSD cards can read and write information faster than others. Having a slow write and read speed can dramatically impact the performance of a device, as it has to spend a longer time writing or reading the data on the card. This is particularly noticeable while watching HD video on a mobile phone, where slow microSD card speeds can cause jittery playback and impact the performance of the video.

5. Class Rating and Speed

Most SD cards now come with a class rating that gives an indication of how fast the card is. The class rating represents the speed at which the card reads and writes data in MB/s. So a card with a class rating of 2 will have a minimum read/write speed of 2MB/s, while a card with a class rating of 10 will have a minimum read/write speed of 10MB/s. It should be noted that the class rating lists the minimum speed that the manufacturer can guarantee, meaning that even class 2 cards can read/write data faster in some instances, and can even give speeds of 4MB/s. However, the trend is clear and higher classed cards will perform better than lower classed cards. In general, a higher class rating is recommended, especially if one is planning on watching HD movies or writing/reading a lot of data off the card. Many cheaper cards have lower class ratings, which mean that they may be cheaper than other SD cards, but will be much slower and will most likely affect the performance of the device that the card is used in conjunction with.

Buying microSDHC cards on eBay

From the main eBay website go to the Electronics category. From there, theCamera & Photo andMobile Phones & Communication subcategories will both lead to theMemory Cards and Memory Card Readers & Adapters categories which will show all the SD cards available. The results displayed can be refined by choosing the criteria in the boxes in the left panel. Criteria for SD cards include format, brand, capacity and condition, making finding the ideal item much easier. The results for the search can also be organised in various ways, from cheapest to most expensive or by listing date. If the buyer wants a specific product, the search bar at the top of every eBay page can be used to search for that specific product, and the results displayed will be from the entire website. This search can then be refined by selecting the criteria as described above.

Conclusion

The differences between SD, SDHC, and microSDHC are dependent on size and on the type of storage format of the card in question. The most important thing to keep in mind is that physical size and storage size aren't correlated, and it is possible to get microSDHC or even microSDXC cards that can store vast amounts of data even though the card is no larger than a fingernail. Knowing which card to choose is dependent on the device that the card will be used with as this will determine whether it is SDHC compliant or not and whether the card will be a normal sized SD card, a miniSD card or a microSD card.

Whether you need it for a phone, a camera, or some other gadget, shopping for a microSD card seems like a pretty simple thing to do, right?

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Yet there’s a lot more to them than you might realize. It’s surprisingly easy to wind up falling into a number of traps: overpaying, getting terrible performance, or the card not working at all.

Let’s take a look at what mistakes you need to avoid when buying a microSD card.

1. Buying Incompatible SD Cards

All microSD cards fit into all microSD card slots, but they don’t all work. There are four different card formats, as well as different standards, and these determine compatibility.

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The three main formats, which you’re probably already familiar with, are SD, SDHC, and SDXC (or microSD, microSDHC, and microSDXC—micro and full-size cards are based on the same spec). The fourth format is SDUC. This was announced in June 2018, and it’ll be a while before the cards are available.

Each format is defined in the SD specification, but they don’t work in the same ways. As a result, the formats are not backwards compatible. You cannot use newer cards in hardware that only supports older formats.

The differences between the formats are significant:

• microSD: Has a capacity up to 2GB, and works in any microSD slot.
• microSDHC: Has a capacity of more than 2GB and up to 32GB, and works in hardware that supports either SDHC and SDXC.
• microSDXC: Has a capacity of more than 32GB and up to 2TB (although at the time of writing, 1TB is the largest available card), and is only supported in SDXC-compatible devices.
• microSDUC: Supports cards up to 128TB, and will require a compatible device.

In addition to checking that a card’s format is compatible with your hardware, you need to check a few other details, too.

Capacity

First, hardware that supports microSDXC slots won’t automatically support every size of card in this format. The Samsung Galaxy S9, for example, officially supports cards up to 400GB. There’s no guarantee that your 512GB card will work.

And if you’re planning to use your microSD card with your PC at any point—for example, to move files on and off—you also need to ensure your PC supports the file systemFrom FAT To NTFS To ZFS: File Systems DemystifiedFrom FAT To NTFS To ZFS: File Systems DemystifiedDifferent hard drives and operating systems may use different file systems. Here's what that means and what you need to know.Read More that the card is formatted with. MicroSDXC cards use the exFAT system by default. Windows has supported it for over a decade, but macOS only since version 10.6.5 (Snow Leopard).

Ultra High Speed

The SDHC and SDXC formats can support the Ultra High Speed (UHS) bus interface—faster circuitry that enables data to move at a quicker rate. The three versions of UHS are UHS-I (with bus speeds of up to 104MBps), UHS-II (up to 312MBps), and UHS-III (up to 624MBps).

In order to benefit from the increased performance of UHS, your hardware needs to support it. UHS memory cards will work in older slots but with a reduced bus speed of 25MBps.

2. Choosing the Wrong Speed

Identifying the speed of a microSD card is even more complicated than deciphering formats and compatibility. There are no less than six ways to show how fast a card is, and it’s not uncommon for manufacturers to use all of them.

Speed Class

The Speed Class shows the minimum write speed of a memory card in megabytes per second. There are four Speed Classes defined as follows:

• Class 2: At least 2MBps.
• Class 4: At least 4MBps.
• Class 6: At least 6MBps.
• Class 10: At least 10MBps.

Showing base level performance helps you to identify whether a card is suitable for a specific task. But because it tells you nothing about maximum speeds, it’s technically possible for a Class 2 card to be faster than a Class 6 card. Class 10 cards should always be noticeably faster, though, as they have a bus speed of 25MBps (compared to 12.5MBps on Class 2 to Class 6 cards).

UHS Speed Class

The UHS Speed Class shows the minimum write speed for microSD cards that support the UHS-I, II, and III bus speeds. We’re listing it as a separate category because some manufacturers list both classes on their cards. The two UHS Speed classes are:

• U1: A write speed of at least 10MBps.
• U3: A write speed of at least 30MBps.

Application Performance Class

The Application Performance Class specifies a minimum sustained write speed of 10MBps, along with a minimum random read and write speeds measured in input/output operations per second (IOPS). This guarantees an acceptable level of performance when storing and running Android apps on your card. There are two classes:

• A1: Minimum random read speed of 1500IOPS; random write speed of 500IOPS.
• A2: Minimum random read speed of 4000IOPS; random write speed of 200IOPS.

The Application Performance Class is something you can look at when you’re planning on installing Android apps on a microSD cardHow to Move Apps to an SD Card on Your AndroidHow to Move Apps to an SD Card on Your AndroidNeed to move apps to an SD card on your Android? Here's how to offload apps and free up storage space on every version of Android.Read More. It isn’t a necessity, though, as cards without the A-rating may still perform as well, if not better.

Video Speed Class

The Video Speed Class sets a minimum sequential write speed, which is essential when shooting video. The higher the resolution your video, the faster speed you need. There are five classes for video:

• V6: Minimum write speed of 6MBps.
• V10: Minimum write speed of 10MBps.
• V30: Minimum write speed of 30MBps.
• V60: Minimum write speed of 60MBps.
• V90: Minimum write speed of 90MBps.

Rated Speed

While it’s generally safe to assume that a higher Speed Class correlates to faster all-around performance, and UHS cards faster still, some manufacturers also quote a maximum speed for their products.

These speeds are in megabytes per second and help you pick out the absolute fastest cards. The speeds are based on manufacturer tests, however, so they may represent a best case scenario rather than real world performance.

In practice, there are other external factors that will affect read and write speeds. If you’re copying files to your PC, for instance, your PC’s specs—and even the USB cable you’re using—will play a role.

Relative Speed

The other way manufacturers show the speed of their cards is a throwback to the old CD writing days. The original transfer rate for CDs was 150KBps. As drives developed, they would advertise themselves as being 2x, 4x, 16x, and so on, showing how many times faster than 150KBps they were.

You’ll often see microSD cards labelled like this. When a card is described as 100x, it means 100 x 150KBps, which is 15MBps. That speed is, again, under ideal lab conditions.

3. Picking the Wrong SD Card for the Task

When you buy a microSD card, it’s important to pick one that is right for its intended use. This means finding a card that is large enough and fast enough, but not necessarily the largest and fastest card out there. High capacity UHS-II U3 cards often still have a price premium and you won’t always notice the benefits they offer.

If you’re using a microSD card to store apps on your smartphone, then consider one with an Application Performance Class rating. But if you want a card so you can shoot 4K video on your phone, go for size and speed as a priority.

The SD Card Association recommends UHS Speed Class 3 (U3) or better for shooting 4K video. For full HD video, it suggests Class 10, or Class 6 at a push. If your card’s write speed is too slow, it will drop frames and produce stuttering video.

For photography, some users prefer several smaller cards to a single large one so they minimize the risk of losing all of their photos if a card corrupts. If you’re shooting RAW, where files might be 50MB or more, you’ll benefit from having U1 or U3 speeds (but they require at least SDHC format).

And in case you’re wondering, there’s no difference between a full-size SD card and a microSD card in an SD adapter. If your camera only has an SD slot, you can still use a microSD card in it.

4. Buying Fake MicroSD Cards

It sounds like an obvious thing to avoid, but sadly, buying fake memory cards is incredibly easy.

If you find a good deal on branded memory cards from a non-reputable seller, there’s a real risk it may be counterfeit. In fact, a few years ago a SanDisk engineer reportedly stated that as a many as a third of all SanDisk-branded cards were fakes. It’s unlikely that that number has declined since.

The buying guides on eBay include a page on spotting counterfeits due to how common they are. Amazon Warehouse sellers have been accused, too. If you’re buying from a source you’re unsure about, check the reviews first.

Counterfeit cards correctly report the capacity shown on the packaging, but actually contain far less. You won’t notice this until the card fills up unexpectedly quickly.

Use the utility H2testw for Windows, or F3 for Mac and Linux, to check that the microSD cards you already own are genuineHow to Spot a Fake MicroSD Card and Avoid Being ScammedHow to Spot a Fake MicroSD Card and Avoid Being ScammedFake microSD cards have misleading high storage capacities. Don't be fooled! Here's how to spot a fake microSD card.Read More.

5. Cheaping Out on Brands

We’ve all owned flash memory cards that have stopped working for no apparent reason. While reliability is generally excellent, microSD cards do fail, and when they do, they’ll take all your data with them.

For this reason, buying cards from big brands is always better than buying no-name cards for cheaper. You can expect better performance, greater levels of reliability, as well as more robustness, with cards routinely protected against shock, water, and even airport X-rays.

You also get things like a lifetime warranty and access to image recovery software. Manufacturers such as Lexar and SanDisk offer this as standard.

What’s Your Perfect MicroSD Card?

So you know how to avoid buying the wrong card. Now all you need to do is figure out what is the right card. What speed do you need for your chosen task, and should you get a massive 400GB card? Our guide to what is the best microSD to buySupersize Your Phone! Should You Buy a 400GB microSD Card?Supersize Your Phone! Should You Buy a 400GB microSD Card?Looking for the largest microSD card? SanDisk's 400GB offering might break all records for size, but its per-gigabyte value falls flat. We've covered the best large-sized microSD cards around.Read More will help you make your decision.

Explore more about: Buying Tips, Memory Card, .

1. Typo in the A2 description:
   'random write speed of 200IOPS'
   should be
   'random write speed of 2000IOPS'

2. Thank You for writing this informative guide. I was searching the internet looking for a card to put into my new, (New to me) Samsung Galaxy J7 Sky Pro. I thought it would be straight forward to just purchase a Micro SD card that had relatively good reviews, boy was I naive!

   I am going to wait until my phone arrives I think after reading your article and then see if perhaps I can get a ride to bricks and mortar store to get one!

   If anybody knows what card I would need for this particular phone I would be extremely grateful to know. The phone is being purchased from Safelink Wireless and I believe they use the Tracfone Wireless company. I am hoping this will end up being activated on the Verizon Network like the phone I am replacing currently is.

   Any buying advise appreciated and Thank You again for such a great article!

3. I think you left out The physical dimensions of the 3 cards are as follows:

   (Full Size) SD – 32mm x 24mm
   Mini SD – 21.5mm x 20mm
   Micro SD – 15mm x 11mm

4. For dash cams and security cameras the SD card must be advertised and labeled as 'high endurance'.

5. Don't EVER buy electronics of any kind from Wish. I had bought a 100 GB micro SD from there for 10 dollars thinking it was a great deal, but it was a fake.

6. Bought a 64GB microsd card off ebay years ago for around $25. I suspected it was fake but decided to take a chance knowing I was protected by eBays buyer protection as well as PayPals. Luckily I did some research about detecting fakes and tested the card using H2testw so I could easily prove it was a fake. Ebay has a frustrating way of going about reporting issues with purchases they required all buyers to contact the seller and attempt to solve the problem. This makes sense for smaller issues but I don't think this is fair for counterfeit items. If you can prove it, that is something that should go directly to ebay's support for review. Anyway, I had to contact the seller and even with screen shots of the H2testw showing the actual card size was really 2gb the seller argued with me insisting it was real and the test was wrong. A week later it was finally escalated to support and they offered me a refund but only after I sent the card back to the seller at my own cost. I flipped sh*t and told them that was ridiculous and they agreed to provide me with a one time prepaid label. I was still angry I had to send it to the seller, who no doubt planned on reselling it but I wanted a refund so I sent it back. Since then I no longer purchase memory cards from ebay or Amazon resellers.

7. I Bought a 32 gb sdhc Samsung Evo plus class 10 card for lyf wind 7i but it is very bad. The file automatically deleted at anytime and apps are not able to recognize sometimes. I shall have always reboot my phone to recognize sd card data. Can you tell me what should I do.please reply..

8. Thank you very much for all of your useful information. I have been doing research on SD cards for mobile phones. I didn't know much to start off with, however, you have provided some very valuable information especially the differences between SD, SDHC, and SDXC. Really enjoyed this post.

9. Hi Just popped a 128gb Scandisk into my HTC M8, formatted it for internal Memory fine for a While. then Phone got Very Hot ! removed Card and re installed it, all seems OK Now, asked HTC & They said it might Not be Supported ? told them it Should be OK up to 2T, They said its Only OK up to 256gb, Am I right in thinking I Read somewhere it Was able to Support up to 2TB if they Ever come onto Market that is ?

   Thanks in Advance

10. How to Choose Right Memory Card for Camera & Gadgets
    How do you choose the right memory card for camera and gadgets? There are plenty of Memory Cards available in the market of different size and speed built for different Gadgets. We selected a list of best Memory cards those are suitable for Camera, Phone, Dash Cams, Photography, Video recording, GoPro, 3DS, PS Vista, etc. You must select the right SD card with recommended card speed and size to get the best performance out from your gadgets.
    When I shop around for memory cards, I was just looking for the print ‘Class 10’. Later I realized there are other important things that I have to consider when I select SD card for my camera and gadgets.
    More:https://mashtips.com/memory-card-buying-guide-for-camera-gadgets/

11. I gave up on buying high capacity memory cards cheaply from the local market after the first one, supposedly 64gb was full after around 10gb were written. Worse, when writing data to the memory card all looked well: it took about the normal length of time per GB and a view of the properties showed the data as there. It was only after trying to retrieve the data that problems became apparent.

    I swapped the faulty 64gb card twice before eventually agreeing to pay double (£20 this time) for a 128gb memory card. Same problem, this time after about 7gb data was no longer retrievable. I tried one more, useless '128gb' card before getting a refund and getting 2x32gb cards for £15 that work absolutely fine and store around about 29gb each - which for £7.50 is acceptable!

12. Once I bought a microSD card for my phone that had 128 GB of storage, only to find my phone only allowed up to 64 GB

    • Lucky for you , you got 64GB , most of these fakes are really only 4GB that continuously rewrite over their own data !

13. What would be the best card for a New Nintendo 3DS XL?

14. Thank you Andy for the info. It is very helpful and I love it.

15. No information on smartwatch sim/memory cards. Difference? the same? Why two slots?

    • A SIM card is what your phone uses to connect to your cellular service provider. A memory card is a removable storage device.

16. Which Card. Should I Buy a 32 GB or a 16 gb when my device support. Maximum of 32 gb

    • 32 GB would be better, but like the article says you need to look at the specs to see compatibility and speeds.

17. Yes I bought a Samsung 32 GB Micro sdhc card from a seller and it was fake
    When I. Used it in multiple devices it currupted

18. Which would be the best micro sd card for an LG V20 ? We own three of these.

19. Excellent review. This has always been a problem with nowadays hi-end cell phones. For example: which would be the best micro SD card for an LG V20 that supports 256 mb expantion ? We own three of these phones and want to expand memory to its maximum level.

20. It was very informative and educative. Thanks for the nice review.

21. Your insight on micro SD cards is outstanding. Thank you for sharing.

    Best regards,
    Sam

22. I just bought an ibasso dx80 Hi Res player. It has 2 slots for micro sd cards (up to 2 tb).
    Which micro sd card would you recommend I use for music? Mostly C.D.'s converted to MP3 for iTunes.
    I'm thinking about going with a couple of 256 gb cards, or maybe even 512 cards.
    I know the more storage the cards have, the more expensive they are, but I've seen 512 gb cards advertised online for $59.99
    Sounds a little too good to be true.
    Thank you.

23. Lifetime guarantee is only useful if you are willing to send your card with personal stuff to the manufacturer. In my case a have a Sandisk class 11 64GB Micro SD card that was working on a Galaxy Note 4 and after only one year of duty is refusing to allow writing. Fortunately I can read everything stored on te card and could recover all my stuff but can't write / format the card anymore (I also backup everything on a regular basis). I've read somewhere that when some kind of error occurs on the card a bit is turned on preventing in an irreversible way further writing to prevent data corruption. Nice idea, but if I can't erase my personal files I'm not going to send it to the manufacturer and will have to buy a new one. I don't really want family pictures and other personal files on others hands. It was my option.

    • Just wondering, did you accidentally put it into read-only mode by moving the switch on the side?

      • Egawheahsrhsr
        'Just wondering, did you accidentally put it into read-only mode by moving the switch on the side?'

        No, there is no switch. It is a micro sd card. And not using any adapter which has lock switch.

    • Guilherme
      lol ?. Same happened to me. My 16GB card turned into read only suddenly. I can view, copy, but not format or delete or write. I have tried so many ways to format it. Now sure I'm not going to send this card to warranty with my family stuffs, contacts backup etc.

24. Help is more than appreciated when it can be utilized in the best possible way. I 'Print' button would be wonderful! Thanks

25. Hi, I am buying an SD card for my Samsung Galaxy J5 and which class should I go for? Is Class 4 gonna be alright? I dont want to spend too much money on it, but I dont want the card to be bad either. I would appreciate any of your sugestions.

26. Maybe you can try our SD cards. LOL.

27. Bought a 32gb card from Amazon and encountered lots of reliability problems kept failing and had to repeatedly uninstall it from phone I installed card recognition app to find it wasn't the brand proportedon the packaging. Had to replace it with a relatively pricier model from a reputable shop in retrospect I should have done this the first time.

28. Did you said that micro SD card and big SD cards will work the same (if compatible). If I use an adapter to use micro SD in camera it will work like big SD card???

29. Add that you should never use a SanDisk Ultra microSD card in a dashcam and you could name the article 6 Mistakes to Avoid.. I've had 3 go bad so far. They can't handle the abuse of the constant writing of HD video. I've t switched to Transcend High Endurance cards for my dashcams.

    • Rubbish i use 64gb ultra cards without ever a problem

    • Excellent idea.

      Transcend have only just begun to make their mark in the consumer market, but prior to that they were well-established in the industrial sector...where customers want high-quality, and long-term reliability above all else.

      Transcend gear is well worth the slight additional price premium.

30. So many fakes on the market. I bought a 16gb in coles that was packaged as 16GB and turned out to be 8GB when i got it home :-(

31. 'In order to benefit from the increased performance of UHS, it needs to be supported by your hardware. UHS memory cards will work in older slots but with a reduced bus speed of 25 MBps.'

    So, does the samsung galaxy s3 i9300 have such a reduced bus speed? In other words, is it worth it to invest in a 'Extreme Pro SDXC 128GB, 95MB/sec class 10 UHS I' for instance, will I ever get to the claimed 95/90mbps speed and does my type of smartphone even need that?

    I will be using it quite a lot to transfer FLAC music files back and forth so it could really be a timesaver.

    Thank you to all who are kind enough to reply.

    • hey, i have galaxy s3 as well, and i also want to buy a similar type micro sd card. did your's work on your phone? i dont mind if it doesnt go to that speed.

      hope you reply

32. it was used in android mobile and now not reading writing .

    Now i install it in java feature phone samsung GT-c3312 , In it although showing folders according mobiles as my moovies , videos etc but after copy any thing it gone out .

    a have a micro SDHC card of 4 GB , it always showing viruses as new folder etc in computer it showing 3.67GB free of 3.68 GB as we format it with format/q but show 3.67 GB and that new folder file as it . I tried with computer manage it shows it 3.69 GB , it format but in last after 99% showing bad (fat32, 4096 bytes) . I tried to format with dos command exfat / 32k ; it starts and in last show failure in 0 sector.

    I tried with norton AV but it don't show any error on it .

    pl help me how format it , with software or specifications.

    Arun

    I tried with SDHC download software but it shows protected file and fails.

    pl help how format so it will usable

33. I was shocked how picky Roku 3 is with memory. 3rd try was finally a success from MicroCenter. Emtec 8MB Class 4. No luck with Microcenter brand nor SanDisk.

34. are you having an epileptic seizure? Can you shake any more?

    • You're so rude. It's thanks to people like Andy that we understand how people are ripping us off. I've bought 4 cards this year, not too cheap and Paypal have paid out on their behalf, (can't see why they would do that), but there you go. I wont buy any cards that aren't from Amazon itself now. The cards were 32GB but actually measured 4.7GB. The music wouldn't be there the next day, all kinds of problems with files. I've had problems with Samsung and Sandisk. Thanks again Andy, appreciated.

35. Can any SD cad reader read/write to any MicroSD cards. My card reader cannot copy or read files from 8GB or larger capacity SD cards. Has anyone experienced the same? While it detects the card and open it when trying to copy files from or paste into get sudden crash.

36. Please suggest good sd card for moto g 3rd gen

37. i'm going to buy a 2TB sdxc card to put to my htc one m8..just wanna know if it's compatible !!
    please help me!

    • Jesus, use google, will ya?

      • wow, i thought this site was to get help !!! if i cud find it in google i wudnt be here would i now???

        • You totally sound like you are making everything up. People who can afford to buy stuff wont be asking stupid questions in forums. You are at best someone seeking attention. And obviously this post wont change that.

        • Elaine, really? It would have been simpler to just give him a short quick answer. However, it is widely known that people that put others down are the ones seeking attention.

    • The card may be compatible but probably will not read the full size of the card. You have probably already done this research but are justified to an answer that does not look down on you.

      • Hey, Darwin?:? Elaine was right about putting the troll in his place. Read the original post?:? he's gonna buy a 2 TB SDXC card. Still don't get it? If you still don't get it I'll clue you in?: first, right now, the biggest SDXC card on the market is 512 GB. You won't find it in any store—heck good luck finding even 256 GB in stores—but it does exist. Its price is slowly coming down?… it's going for around $400 right now, down from about twice that a year ago. But even at $400, no one besides a handful of companies and the odd rich individual here and there buys 512 GB cards yet obviously.

        Secondly?:? just recently, about 3 months ago in September (and 3 months *before* your friend Nanath Jayawickrama made his ridiculous post, SanDisk® announced they created the biggest SD card in the world?:? a prototype card with an outrageous 1 TB of memory. At this point it's only a prototype as I said?—?no details available on price or even projected release date.

        Still, your happy doofus of a friend, whose defence you immediately sprung to and whose post you didn't even bother trying to understand, bounced into this comment forum and announced he's buying a 2 TB card, i.e. a product which not only does NOT exist and will NOT be on the market at a reasonable price for YEARS, but a product which is still so much on the drawing board that a prototype of it does not even exist.

        But still, your friend is buying one for his HTC, isn't he? Note that even if Elaine didn't zero in on the precise technical reasons why your friend (yes, I insist on calling him that) is a complete b*llsh*tter, she was still savvy enough to smell out his status of resident attention-seeking troll, wasn't she? And your friend the troll didn't thank you for 'saving' him, did he? It's admirable to have a kind heart, but if you don't use your mind and logic to pick WHO you defend a little better then (a) you'll come across as gullible, but possibly more importantly where you're concerned, (b) your effort will have been wasted.

38. My 128GB SanDisk microSD SDXC failed. I get a refund of the value on the guarantee, but 'access to image recovery software (to retrieve data from a damaged or corrupted card). Manufacturers such as Lexar and SanDisk offer this as standard.' Sandisk Recovery Service is $375.

    • Make a habit of backing up your phone every week.

    • My Lexar card is corrupt. So one pays a premium for the card, when it's corrupt you pay again for the person who sold you the card to do what you you paid for in the first place.

39. Hey there, I am using Lenovo A6000 and I want to buy a 32 GB memory card for my mobile phone.
    Can someone help me to decide which card should I buy?

    • You can buy SanDisk ultra SDHC class 10, it's around 1k in Flipkart. It's reliable and working good. I have suggested the same card to two other friends they also found it good. I'm using this for 2 years now and it worked in my motoe2 as well as in my Lenovo K4 note. Hope it helps..

      • I guess you have knowledge on lenovo. Does SDXC with exFAT supports Lenovo android devices??? I have recently bought the new K6 Power

        • As far as I know mobile phone uses microSD cards. SDXC and SDHC are built for cameras. Yeah, mobile phone can run fat32 , exfat and NTFS file formats. If you are worried about it you can reformat any memory card in PCs. If you have any queries you can ask me personally 'dibbenduk@gmail.com'

        • sorry, only windows run NTFS file format fat32 is best for mobiles. If your K6 power don`t support exFAT you can simply reformat it in you computer.

      • Yes I know how to format. But I specifically the exFAT support as I download a hell loads of torrents in my phone. FAT32 will not meet my requirements. NTFS is not working as I've tested with my ext hdd, but cannot format it now cz again I need to transfer back 1.9 TB files back. So I needed to know from someone who has already tasted it. My 64GB SDXC is already on its way.

    • Buy SanDisk ultra SDHC class 10. It works very well. I'm using it in my Lenovo Vibe k4 note.

40. Thanks for this informative article. However, I would like to know if a MicroSD card reader can read MicroSDHC cards or not.

41. Hi, I own a Samsung Galaxy J5 which has a capacity of 128 GB. I seem to be unable to buy a 128 GB SDHC card for this, as they all seem to be selling only SDXC at this capacity. Or does anybody know differently? I notice many sellers list these as SDHC, but on the picture you can clearly see SDXC, regards, John

    • SDHC=4gb-32gb SDXC=32gb or larger. It's just a technically name to indicate the capacity of the card and speed is totally different story. I'm sure they listed wrong.

42. Really helpful thread.Thumbs up from Athens.

    • Agree, very helpful overview. I was copying over music to a 128gb card, and it crapped out near 8gb. I thought it was my old machine until this article. Cheers.

43. I don't understand why do we need UHS cards for shooting 4k video? A typical 4k bit rate would be 30 mbps or not more than 4MBs fo which a class 4 SD card would be perfectly OK.
    Why do we need speeds of 30 or 48 or even 90 MBs ? Is this uncompressed bit rate ???

    • 4K uses about 6MB/s on my Samsung Galaxy S7. Professional video cameras would likely use much more than that. MicroSD cards with speeds of 80-90 MB/s aren't that expensive anyway.

44. Thanks for this very informative article. For some time I have been stymied by a number of micro SD cards I received as surplus from my daughters company. I was trying to format 32GB micro SDHC cards with a Micro SC adapter and all of them failed. Now I understand why and just purchased an SDHC adapter to see if it will solve this problem.

45. Does anybody know which one is the perfect for the new galaxy s7 in order to shoot 4k videos?

46. Does anyone have recommendations for what has worked well for a Raspberry Pi?

47. And if I use a SDXC card (exFat) in a camera and connect the camera via USB to a PC (Windows 7) having a NTFS drive, may I expect that the file transfers will work?

    Regards.
    Vicente Olmos, Madrid, Spain

48. I've used SDXC cards with devices that only claimed support for upto 32GB SDHC twice now - a Samsung Galaxy S II and a 3rd gen Moto G. Naturally, the card had to be reformatted as FAT32 rather than the default exFAT, as neither supported the latter filesystem, but otherwise usage was trouble-free.

    • Yes, exFat will be readable and writeable both in linux (android) and windows.

49. 'Counterfeit cards are configured to report the capacity that is printed on the packaging, but actually contain far less. You won’t notice this until the card fills up unexpectedly quickly.'

    Worse yet, the filesystem will 'loopback,' overwriting the files on the disk while still reporting the first files written (which have been lost).

    One eBayer bought a 'pocket hard drive' which had a tiny USB drive inside, and two metal nuts to hold it in place.

50. HI Andy,
    Great article and very informative. Its true that sometimes we don't bother for the memory cards but its very important to buy a good branded and good quality of higher class of memory card to secure your memory and to faster data transfer. I must say very well written and personally i used 64GB [ http://www.bdshop.com/sandisk-ultra-64gb-microsdxc-uhs-i-48mb ] which is really good so far and i am fully happy with that but in some cases few cheap Chinese memory card can't perform as it written. I had a very bad lesson with that kinds of cheap card and after that i am using the above memory card which i am using on my S4 and its almost a year now and i didn't face any issue.
    Finally i must say everybody should know the above facts before buying a memory card. Thank you Andy once again for your details information and examples.

    Regards,
    Zakir Hosen

51. Very useful, however one thing that bothers me, is the 'HTC One M9' up to 128gb, which is not true; it supports to 2tb since launch, i'm using a 256gb card and it is working normally.

    • Well, in the last section of the paragraph labeled size, what you said is kind of a moot point, because there is a vast amount free premium partitioning softwares out there, nowadays.

    • Indeed, that is a significant error in this article. The HTC One M9 does support up to 2 TB and has since launch. The author needs to fact check better. Though it's not too important in the scope/setting of this article except to the owners of a HTC One M9. Like us :)

      • I have had an HTC One m9 since release, but no one, AFAIK can buy a 2TB card yet for it, because there are none available, and won't be for at least another year. It is *expected* to support it, but no one can say for sure that it will. Maybe 512GB will work (whenever it eventually comes out), but even that's not guaranteed. So, fact-checkers, just because the marketing people say something doesn't make it true. For example, many people voted for Pedro, but all their wildest dreams didn't come true. Fact checking has sadly been reduced to proficient googling without any corresponding skills in using common sense.

52. Very useful and well written.

53. Very informative. Thank you very much!