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External Hard Drive 'not accessible'

Discussion in 'Hardware' started by n4syth, Aug 1, 2006.

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  1. n4syth

    n4syth Thread Starter

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    I have an external hard drive case, that I have been using to access a variety of IDE drives via USB for quite some time. I recently attached it to a new computer -- it was detected, installed, recognized as IDE to USB, appears in My Computer/Explorer, even the make of HD noted. When I attempt to open it I get a message stating that it is 'not accessible...... because of an I/O error'.
    Message the same for any HD installed in case.
    Still works fine on old computer but I am trying to migrate everything to the new system.
    Another similar setup for notebook hard drives works on both computers...
    'Case' is USB 2.0 as is new computer. Old computer is USB 1.1
    'Case' powered by adapter not USB.
    All computers running WinXP Home.

    Any help you can give me would be greatly appreciated!!!
     
  2. JohnWill

    JohnWill Retired Moderator

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    Create a file with NOTEPAD containing the following lines and save it as FIX.REG
    -------------------------- Use text after this line --------------------------------
    REGEDIT4

    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]

    "DEVMGR_SHOW_NONPRESENT_DEVICES"="1"
    -------------------------- Use text before this line --------------------------------

    Double click on FIX.REG and say yes to the Merge Into Registry question.

    Unplug ALL USB devices.
    Open Device Manager.
    View, Show Hidden Devices.
    Uninstall all devices under USB Controllers.
    Uninstall all devices under Disk Drives that you know are not present.
    Uninstall all devices under Storage Volumes. Say no to any reboot prompts until you are finished. Also, if a Storage Volume doesn't uninstall, ignore it and move to the next one.
    If you have a yellow ? with unknown devices, uninstall all of the entries there as well.

    When this is done, reboot TWICE.

    Reconnect the USB devices and see if they're recognized properly.

    NOTE: If you have a USB keyboard and/or mouse, you'll have to modify the instructions and leave enough parts for those to function. I don't have one yet, so I haven't had time to modify the instructions.
     
  3. n4syth

    n4syth Thread Starter

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    Followed your directions and everything installed fine.... BUT still can't access information on the ext. HD...... Same as before.
    Any other suggestions?
     
  4. JohnWill

    JohnWill Retired Moderator

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    Time to take the physical hard disk out and connect it as a secondary drive in a desktop machine. If the problem is with the USB case, you'll be able to access the data. If the problem is the drive or data corruption, it's far easier and more effective to recover data from a directly connected drive.
     
  5. Bob Cerelli

    Bob Cerelli

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    Does it still work in another computer. If so then likley the USB and hard drive are just fine. Also it looks like you get that error regardless of the hard drive in the case.

    Does any other USB device work on the same port
     
  6. n4syth

    n4syth Thread Starter

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    Yes it does still work when attached to my old computer -- no problem accessing files there, so hard drive, cables and external case connections appear to be OK --- just don't want to keep the old computer around for this purpose....
    Have even tried switching HDs on both computers and get same results for all of them --- accessible with old system and 'I/O error' with new...

    Have tried different USB ports and get the same 'I/O error'. Other devices connected via these ports also work so USB ports OK.

    Laptop HD connected via similar external connection is also fully accessible.....

    Got me stumped.....:confused:
     
  7. JohnWill

    JohnWill Retired Moderator

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    It may simply be a compatibility issue with that specific USB case. I have a USB case that won't work on one of my systems, but will on any of the others. I had to replace the case with a different model to get reliable operation with all the systems.
     
  8. Bob Cerelli

    Bob Cerelli

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    From the first post that does seem to be the "case"
     
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