Windows 8 and 8.1 Forums


32GB Micro SD Card Slower than 16GB

  1. #1


    Leicester
    Posts : 107
    Windows 8.1 Pro X64

    32GB Micro SD Card Slower than 16GB


    Hi, I have an Asus Transformer Book T100 and I wanted to use my SanDisk 32GB UHS Speed Class 1 Micro SD Card however when I copy files onto it (Usually large files) it starts to copy really slow but eventually stops. Comparing this to my 16GB Micro SD card which is only Class 4, it copies way faster. Both cards are SDHC andmade by SanDisk. Why is the 32GB card slower than the 16GB even though the 32GB card is rated faster?
    Thanks

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  2. #2


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    It depends on what the speed class the 16gb is. SanDisk has the info on their website about this. Secure Digital - Wikipedia, the free encyclopedia
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  3. #3


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    Yeah right. A Class 1 is really slow. You should really have a Class 10 card. I use that in my T100 and the performance is acceptable - but not more. I have all my user files on it and I also store images on it.

    I also use a fast USB3 flash drive. That is a lot faster.
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  4. #4


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    A class 1 UHS is supposed to be as fast as a class 10 standard speed SD: https://www.sdcard.org/consumers/speed/
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  5. #5


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    Quote Originally Posted by popeye View Post
    A class 1 UHS is supposed to be as fast as a class 10 standard speed SD: https://www.sdcard.org/consumers/speed/
    But it looks like the OP is using a slow normal Class 1
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  6. #6


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    He said UHS, all these stupid cards does get confusing.
      My System SpecsSystem Spec

  7. #7


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    Right, I missed that, sorry.
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  8. #8


    Leicester
    Posts : 107
    Windows 8.1 Pro X64


    The 16GB card is Class 4. The 32GB card is UHS-1. The are both formatted with NTFS and the Default allocation size. I do not understand why the 32GB card is slower.
      My System SpecsSystem Spec

  9. #9


    Germany/Florida
    Posts : 4,514
    Vista and Win7


    You can run it thru HD Tune and see what the facts are. HD Tune website
      My System SpecsSystem Spec

  10. #10


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    Sure it isn't fake? Lot of them out there.
      My System SpecsSystem Spec

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32GB Micro SD Card Slower than 16GB
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