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Harddrive Problem

Discussion in 'Electronic Repair' started by cajuncalibration, Aug 11, 2005.

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  1. I have a harddrive, a seagate barracuda 7200.7, model st3120022a, that
    stopped working. I was doing a routine virus scan and got a blue
    screen (I'm using XP, so this was abnormal), and the drive was broken.
    It wouldn't detect it in bios, and the drive was spinning and clicking
    periodically. Same thing on a different computer. I figured the
    controller board had gone bad, so I bought an identical working drive
    and switched out boards, and still the same thing. Since I could hear
    the platters spinning, I knew they weren't locked up, but the periodic
    clicking got me thinking that the heads were possibly stuck on
    something (made sense at the time, I don't know why). In a last ditch
    effort to get a few files off this drive, I opened it to see if the
    platter/heads were free, and both were. I know this drive is now
    ruined, I just hoped that the heads had gotten stuck or something, and
    I could get it running for a minute or two to get a couple peices of
    info off of it and then send it on it's way to the junk box. The
    heads just move out onto the platters from the center and immediately
    return to the center, about once a second. Now I'm just curious what
    could cause this? Any Ideas?

  2. For most drives, the read amplifier (a chip) is inside the sealed
    enclosure (not for environmental protection; to get it as close as
    possible to the heads). If it has failed, changing out the main board
    won't help. Look for it soldered to the orange flexible circuit "board"
    that exits the enclosure.

  3. James Sweet

    James Sweet Guest

    Probably the head amplifier chip on the head assembly failed, or it could be
    one of the heads itself. I've had some luck putting drives with this problem
    in the freezer for a few hours then powering them up to copy the data off,
    now that you've opened it it might be too late though.
  4. Just tried freezing it, of course it didn't work, I'm sure the drive
    is totally gone now. Anyway, worth a shot.

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