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[Bug-ddrescue] Reading past errors on a non-scsi drive
From: |
James Bardin |
Subject: |
[Bug-ddrescue] Reading past errors on a non-scsi drive |
Date: |
Mon, 02 Apr 2007 10:46:50 -0400 |
User-agent: |
Thunderbird 1.5.0.10 (X11/20070306) |
Hello,
This may be a feature request, or just advice is it's already possible.
I'm trying to read through a disk in which there are errors that cause
the disk to wait indefinitely. (I've had to recover many disks in this
state, so I'm surprised that I can't find a info on this)
When this happens on a scsi disc, the read times out, the controller
dumps the memory, and we move on.
On other types of disks, we hang. I've tried reading both from the block
device, and raw character devices.
My current solution is to use a usb adapter, and pull the connection
when it stops reading, then start again from a different block. This is
fine when there a few bad areas, but I'm looking for an automated
solution for more serious recovery.
I'm not sure if this is even possible without additional features in the
kernel. I've been following a related thread on lkml about a true forced
unmount that would drop pending io:
http://www.gossamer-threads.com/lists/linux/kernel/745783
Or, if someone knows a way to forcefully remove, and reinitialize a usb
device via software, I could use that as a workaround for now.
Thanks
-jim
- [Bug-ddrescue] Reading past errors on a non-scsi drive,
James Bardin <=