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iomega 2tb not showing up on MacBook Pro

I have a 2TB white iomega external drive running with an older MacBook Pro (15in circa 2008). It just came up with a "This disk is unreadable" error on two different Macs. When I try Disk First Aid, it doesn't seem to recognize the partition either. Ideas? Thanx in advance.
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  1. Best answer
    Possible drive failure or bridge-chip failure, a common issue with external hard drives as internal ones don't have a bridge-chip (it's just a small PCB inside the enclosure which handles the SATA-to-USB or Firewire interface conversion).

    If it's just a bridge-chip failure, you can overcome that by buying a third-party hard drive enclosure for your Iomega drive. The third-party enclosure will have it's own bridge-chip.

    If the drive exhibits the same issues as before, it has probably failed, which you can confirm by testing it with SeaTools (on a Windows PC of course, there is no Mac version): http://www.seagate.com/gb/en/support/downloads/item/seatools-win-master/
  2. Phillip Corcoran said:
    Possible drive failure or bridge-chip failure, a common issue with external hard drives as internal ones don't have a bridge-chip (it's just a small PCB inside the enclosure which handles the SATA-to-USB or Firewire interface conversion).

    If it's just a bridge-chip failure, you can overcome that by buying a third-party hard drive enclosure for your Iomega drive. The third-party enclosure will have it's own bridge-chip.

    If the drive exhibits the same issues as before, it has probably failed, which you can confirm by testing it with SeaTools (on a Windows PC of course, there is no Mac version): http://www.seagate.com/gb/en/support/downloads/item/seatools-win-master/
  3. Thanx Phillip. Is there a diagnostic for Bridge Chip Failure?
  4. If there is, I know nothing about it. Sometimes the only diagnostic test is simply to try a different unit, in this case a different enclosure.
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