Windows 10: Copy Files from Hard Drive to SD Card - Painfully Slow Transfer

  1. Posts : 1
    Windows 10 Home x64 bit
       31 Jan 2017 #1

    Copy Files from Hard Drive to SD Card - Painfully Slow Transfer

    I am in the process of transferring files from my laptop's hard drive to a 256 GB SD card in the laptop's card reader slot. The transfer started quickly but then it slowed down drastically and has stayed down since. I've looked at some similar posts and tried a few of the fixes that worked for others but none of them have worked for me and I'm still transferring at an incredibly slow pace.

    I should note that I'm transferring music files from my computer to the SD card. I have about 50 GB that I would like to put on the card but it would take me a week at the rate it's going now.

    Anyone have any suggestions?

      My ComputerSystem Spec

  2. sml156's Avatar
    Posts : 667
    Microsoft Windows 10 Pro 64-bit
       01 Feb 2017 #2

    SD cards are usually always painfully slow nothing you can do about it unless you spend about 10 times the price and get the faster ones.

    From what I remember the fastest I have gotten is around 8 MB/s on the cheaper type, I have never used the more expensive ones.

    Here are the speed class marks.
    Note: You probably have a class 10Click image for larger version. 

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      My ComputerSystem Spec

  3. Posts : 893
    Windows 10
       01 Feb 2017 #3

    I have SD cards labelled as Class 10 U-I 45 MB/s, under testing with small files I get a writing speed of 18 MB/s. Thus meeting the min spec of such cards.
    I won't buy anything slower than that, or from dubious suppliers.

    Also worth checking cheap Cards for capacity fakes, I use H2testw 1.4

    For your amount of data on my Cards it would take roughly ~60 min to write.
      My ComputerSystem Spec

  4. Posts : 1
    Windows 10 64 bit
       05 Aug 2017 #4

    I have the same problem when transferring music from my C: SSD drive to the memory card slot in my laptop. Unfortunately, the memory card slot only runs at USB 2.0 speed. I resolved the problem by connecting the SDHC card to the laptop in a USB 3.0 to SDHC adapter, through the USB 3.0 connector. BINGO! The writes to the memory card increased from a few hundred KB per second to 8-10 MB per second. I even found a bargain on the adapter on Amazon here:

    Happy copying!
      My ComputerSystem Spec

  5.    15 Nov 2017 #5

    SD writes at 4-5 KB/sec

    OK, but all this talk of the speed of SD writes doesn't address when the speed is 4-5 KB/sec. I could live with 1 or 2 MB/sec. I have two Dell laptops running Win10 with all drivers updated and that is the speed of SD writes I'm getting on both of them with their SD slots. Both are using Class 10 SD cards. I can boot to Linux on a flash drive and get those MB/sec transfer rates. So what is Win10 getting wrong here?
      My ComputerSystem Spec

  6. Gordon7's Avatar
    Posts : 182
    Win 10 rs1 - build 14393.1944
       15 Nov 2017 #6

    Try to shut down your AV (If running Defender, then also shut down Smart screen) ! When transfer files to/from USB/SD-cards
    AV's are often the cause of slow down!

    You can also try a very fast 3. party copy app. - :
    Last edited by Gordon7; 15 Nov 2017 at 17:46.
      My ComputerSystem Spec


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