My external hard discs get "corrupted" by my Mac

Discussion in 'Mac Basics and Help' started by bollweevil, Nov 18, 2008.

  1. bollweevil macrumors 6502

    Feb 1, 2008
    Why does my Mac somehow "corrupt" every external hard drive it touches, such that they don't work with PCs any more but they continue to work with the Mac?

    I have two USB external hard discs. When I started, they both worked fine with my PC. Then I plugged one into my MacBook Pro - the Mac saw everything on the drive and was able to copy it. Then I dragged the drive's icon to the eject icon. The drive's icon dissappeared, and I waited a while. There was no "safe to remove hardware" message like a PC would have, so I just unplugged it.

    Upon plugging it back into the PC, it didn't work. The "safely remove hardware" icon in the system tray of the PC did appear, and the USB window in my control panel says "Unknown device". Upon unplugging the drive from my PC and plugging it back into the Mac, it did work. The Mac can see the drive, not the PC.

    I did this with another drive, and the same exact thing happened. Now neither drive works with the PC, both still work with the Mac. I didn't reformat either of the drives, they both contain data from before I owned a Mac and the Mac can access that data.

    What happened? Thanks.
  2. drunifex macrumors member

    Nov 18, 2008
    Seen this before

    I had the exact same thing on a colleagues laptop a couple of years ago. Turned out he had installed some virus scanner on his laptop and it was destroying every file copied (or modified) on his external drive.

    If you have anything like that installed disable and try it out.
  3. bollweevil thread starter macrumors 6502

    Feb 1, 2008
    My PC has anti-virus software, my Mac does not. I totally disabled the anti-virus software (it is stupid that this is possible - if I can disable it, so can a virus), and still no luck. Also of note: All of the data on the hard discs is still there, and still in perfect shape. I can see the data with the Mac. It hasn't been destroyed.
  4. bollweevil thread starter macrumors 6502

    Feb 1, 2008
  5. patrick0brien macrumors 68040


    Oct 24, 2002
    The West Loop

    Well you got me. It sounds like the disks are NTFS formatted, which the Mac can read/write to just fine. Your PC's shouldn't know the difference.

    One thing, when you 'Eject' a disk, the moment the Icon disappears (Unmounts), you can unplug.

    Do you have anything you can think of, Mac software that could be out-of-profile? Utility shareware? Any scripts running?

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