1.    08 Apr 2016 #1
    Join Date : Sep 2015
    Posts : 2,377
    Windows 10 Pro 64-bit 1706 (CU build 15063.674)

    USB card reader keep disconnecting


    I have a USB card reader that I use with a Micro SD card to record my favorite series from a DVB-T set-top box when at work so I can watch it later. While recording it works OK due probably to the low data rate required. The problem arises when I connect it to my computer to copy the video files. This is copying at full speed (about 19MB/sec) and has a problem with large video files. It hardly can finish the copy successfully. It is very likely that some time during the transfer the USB card reader will lose power and disconnect. The workaround is to attend the copy process and pause it for a few seconds at regular intervals until complete. When it fails I can disconnect and reconnect it and then click on "Try again", but this starts from the beginning of the file!

    Before I throw it in the waste basket, I thought I'll give it a second chance. Is there any way to control the transfer speed so the card reader can cope with it and not disconnect? Is there a way to give more power to it, to give it priority, whatever? Any possible solution? I hate to attend the transfer and fear that it may fail at any time and have to start all over!

    Thank you!
      My ComputerSystem Spec
  2.    27 Apr 2016 #2
    Join Date : Sep 2015
    Posts : 2,377
    Windows 10 Pro 64-bit 1706 (CU build 15063.674)
    Thread Starter


    I found a solution and I want to share it to help others.

    I read somewhere else about a utility called Ultracopier which takes over the standard Windows copy/cut-paste procedure and supports pause/resume (for earlier Windows versions that didn't have that), and other features. The most important feature, that actually did the job for me, is SPEED CONTROL! Yes, you can limit the maximum file transfer/copy speed to an exact amount in KB/sec. I noticed that my card reader can work OK with slow Class 4 cards, but cannot make it with faster Class 10 cards and temporarily disconnects and the transfer is screwed. The maximum speed cannot exceed 18MB/sec, so I use Ultracopier to limit transfer speed at about 18000 KB/sec. Now it almost never fails! In the rare occasion that the card reader will lose connection the transfer can resume from that point, while with the standard Windows interface I would have to start from the beginning of the file! It can also be used in earlier Windows versions that resuming is not supported and you would have to start the whole transfer again!

    You have to try it! I recommend it to everyone. One side effect I noticed is that all transfers, even from one folder of the hard disk to another, are limited at that speed, but I can just uncheck a simple checkbox to disable the limit and complete these transfers at full speed.

    I hope that helps!
      My ComputerSystem Spec


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