Hard disk failure of some sort - files still there, filesystem gone!

Discussion in 'macOS' started by Inconsequential, Jan 10, 2011.

  1. Inconsequential macrumors 68000

    Sep 12, 2007
    Disktest gives this:

    check_FAT: Unusual media descriptor (0xf0!=0xf8)
    Warning: Incorrect number of heads/cylinder 16 (FAT) != 1 (HD)
    Warning: Incorrect number of sectors per track 32 (FAT) != 1 (HD)
    EFI System 40 409639 409600 [EFI]
    Mac HFS 409640 3906766983 3906357344

    What's wrong with it, how do I fix it?

    All the files are there, I just can't get at them through OS X! :confused:

    It's an advanced format drive so maybe something isn't playing ball?
  2. davidlv macrumors 65816

    Apr 5, 2009
    Kyoto, Japan
    Did you try booting up from the original OS X Install DVD? (c key or Option down at startup) Run Disk Utility from the Utilities Menu after selecting a language.
    If Disk Utility can not repair the errors, you should try Disk Warrior which requires a bootable DVD (Alsoft's DVD will boot all but the latest Macs, check the web site for full info) or a bootable external HD with Disk Warrior installed.
    If Disk Warrior can not fix it, it is likely there is a hardware issue and you will have replace the HD.

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