problem reformatting 3Tb AF drive

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problem reformatting 3Tb AF drive

Post by mjt5282 » Mon Oct 08, 2012 1:17 pm

I had a 4 disk test zpool, that had a working raidz1 (4 disk) 3Tb WD AF drives. I had a big problem and want to reformat them and try over. I get "error -69760: Unable to write to the last block of the device" on 2 of the discs and they fail at the diskutil eraseDisk step. Any suggestions how to reformat and start over on these two disks? DOS fdisk? Linux gparted ?
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Re: problem reformatting 3Tb AF drive

Post by NakkiNyan » Mon Oct 08, 2012 1:40 pm

Sounds like you might have a bad disk. I had the same error on a disk that was failing so I was using it as a test drive until it gave me that error.
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Re: problem reformatting 3Tb AF drive

Post by grahamperrin » Mon Oct 08, 2012 1:45 pm

Off-topic from installation

I can't find a record locally, but "Unable to write to the last block" is familiar.

Whilst topics such as "Unable to write to the last block of the device" in Apple Support Communities have workarounds for the symptom, I'd suspect a hardware issue.

In Super User, Fix bad blocks on Mac hard diskan answer there suggests:

  • boot from an Ubuntu Live CD, run badblocks

Postscript

mjt5282 wrote:… 2 of the discs and they fail at …


If failure (or future failure) of two is a possibility: you might be wary of using them in RAID-Z – even after running badblocks (or whatever you choose to verify integrity of the media). Proceed with caution … the usual … have backups, etc..
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