Copy queue length high Write speed is low RRS feed

  • Question

  • hello,

    I'm using Windows 7 x64 sp1,intel i5 2500,14GB available RAM .When I copying  some files the disk write queue length can reach up to 4 and wirte speed is about 70MB.I thought there might be something wrong with the system,since it was installed 3 years ago,so I did a fresh install,but the issue remains.I used a 3rd party file copy tool to copy the same files ,queue length is 1,write speed is 160MB.

    Then I rolled back to Windows XP,everything is back to normal ,write queue length is always below 1.25 and write speed is 150MB. 

    What could be the problem?


    Saturday, August 9, 2014 9:13 AM

All replies

  • Hey,

    You might want to have a look on device drivers, power settings, and also verify if the disk cache is enabled or not.


    best regards

    jesper vindum, denmark

    Saturday, August 9, 2014 9:59 AM
  • Hi,

    Thanks for your reply.

    All disk related driver provider is microsoft,and I also tried intel driver,nothing happened.

    Power setting is set to balanced,tried High,nothing happened.

    Disk cache is enabled by default. 

    In my opinion this issue is not related to driver,powersetting or cache.

    It's more like a software issue,cause under the same driver,powersetting and cache setting,just use another file copy software and the result will be totally different.

    If win 7 is 50% slower than win xp?I don't think Bill Gates would allow this kind of thing .

    Saturday, August 9, 2014 10:22 AM
  • Sorry, I missed that part in your intro :)

    You use explorer to copy? what about copy (cmd) or xcopy.


    Saturday, August 9, 2014 10:32 AM
  • Yes,I did use explorer and I just tried xcopy,but with no luck.

    Saturday, August 9, 2014 10:52 AM
  • Hi,

    Try to run this check on each volume in question to look for errors.

    chkdsk x: /r (where x: is the volume to be checked for errors)

    For more information, please refer to this article:



    If it doesn't help, please perform a clean boot to check the result.

    Karen Hu
    TechNet Community Support

    Tuesday, August 12, 2014 5:43 AM
  • Hi,

    Diskcheck turned out to fine.

    Clean boot didn't change a thing.

    Saturday, August 16, 2014 9:53 AM
  • How do you get that info?

    Tuesday, August 19, 2014 5:08 PM
  • Er...

    Which one?

    Thursday, August 21, 2014 1:46 AM
  • Copy queue length and write speed.
    Tuesday, August 26, 2014 5:02 PM
  • windows perfmon.
    Thursday, August 28, 2014 11:46 PM