If you plug out the USB harddisk without remove it in Windows.
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It should still be recognized. Try replugging it into a different USB-port and into a different computer (using proper dismounting). This could be the solution to your problem. If it is not, you have probably killed the indizes or partition tables. That happens when you unplug an USB-HDD while it is writing. You may also have fried the USB-to-IDE bridge, which sits between the built-in HDD and your computer. You might want to try to use the Administration panel (right-click on the "my computer" icon) to re-partition the drive. That is the quickest solution if there is no important data to recover. If there IS important data to recover, try using a different USB-to-IDE bridge and/or plug the drive directly into a IDE-channel and try reading it from there. If its recognized, but not accessible, a disaster-recovery tool might help. AFAIR, SpinRite (www.grc.com) can recover destroyed indizes and tables. Cheers, Sebastian -- Contra vim mortem non est medicamen in hortem.