External SCSI hd "medium format corrupt"

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External SCSI hd "medium format corrupt"

Unread postby jessedewaard » Tue Aug 23, 2016 1:18 pm


I recently got a sun external scsi harddisk with a WD disk inside that worked fine when i first plugged it in.
I then tried to format it using fx, and during the format i shut down the disk(had to go away, as it took a very long time).

Now the Indigo 2 hangs on Power-on Diagnostics and shows the following error: medium format corrupted
When it passes i can not access the disk using fx.
The following message is displayed:

IRIS 1# fx
fx version 5.3, Oct 18, 1994
fx: "device-name" = (dksc)
fx: ctlr# = (0) 1
fx: drive# = (1)
...opening dksc(1,1,)
fx: Warning: Failed to open /dev/rdsk/dks1d1vol

How can i recover the disk, can dd be used for this?

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Re: External SCSI hd "medium format corrupt"

Unread postby dexter1 » Tue Aug 23, 2016 1:39 pm

Previous post searches reveal this:


The tarball for setblocksize is still available. Mind you, i suspect it's a linux tool so you should have a system with SCSI controller available.
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Re: External SCSI hd "medium format corrupt"

Unread postby robespierre » Tue Aug 23, 2016 2:43 pm

Why did you need to format it to begin with?
Format operations should almost never be performed (especially not without uninterruptible power supply) for precisely this reason. Once the operation is started, it must be allowed to finish, or the disk is left in an unusable state. There will be no indication of progress until it has finished.

There is nothing special at all about the Linux tools, any system with a direct SCSI driver can send a format command to a disk. I once wrote and tested an IRIX format utility in half an hour. This requires that the disk is able to initialize itself and receive commands.

Otherwise, the disk is unrecoverable.
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