Re: Source of delay when reading bad sectors
- From: CBFalconer <cbfalconer@xxxxxxxxx>
- Date: Mon, 15 Jan 2007 13:21:35 -0500
Giovanni wrote:
Michael Mol wrote:
I find myself frequently in need of performing disk-to-disk copies
from a bad hard disk to a good hard disk, for system recovery
purposes. Normally, I would use dd for disk-to-disk copying, but
that doesn't work well for damaged disks.
The problem stems from a half-second (or so) delay each time dd
tries to read a bad sector from the damaged disk. What is the
source of this delay? I'd like to modify the kernel to remove, or
at least lessen, it.
The kernel tries several times to read the bad sectors and, after a
number of tries recalibrates the controller. I don't think that it
is a good idea to change this behavior.
It would be somewhat more efficacious to replace the bad disk.
--
"A man who is right every time is not likely to do very much."
-- Francis Crick, co-discover of DNA
"There is nothing more amazing than stupidity in action."
-- Thomas Matthews
.
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