Warner Losh wrote:
> OK. I have a disk drive that is failing in random ways. Today blocks
> 123 456 and 293 might be unreadable. Tomorrow, it might be these and
> 27 or it might just be 27. It is an IDE drive. I was wondering if anybody
> had a program that would read the entire disk and keep a list/bitmap of
> the bad blocks and try them again next time the program is run. Operating
> on a slice or partition level would be ideal (I have a 20G disk that
> is failing, but only about 18G of free space).
>
> Ideas?
>
> Warner
>
> P.S. Basically what I want at the end of the day, disk willing, is
> what dd if=/dev/ad8s2a of=/huge/big-honkin-file ... would give me.
> I want this so I can then dump it to tape. I can't run dump directly
> since it hits those bad blocks and whines.
I have 2 C programs you might like to extend/ plunder `for parts' :-)
http://bim.bsn.com/~jhs/src/bsd/jhs/bin/public/valid/valid.c
& valid.1 Makefile
http://bim.bsn.com/~jhs/src/bsd/jhs/bin/public/slice/slice.c
& slice.1 Makefile
valid:
rescues (or writes) arbitrary (or all) sectors of a floppy,
but can also be given the name of other devices eg hard disc & normal files.
It works best on dos ! as dos returns the buffer even if there's a crc error,
If someone hacked the bsd kernel to return the read() buffer even on error,
it'd make it equally usefull to rescue sectors on bsd too.
slice:
rescue data off bad tapes with intermittent drivers, first written to run on
BSD4.2 nsc32016, also runs on freebsd of course.
More info in the manuals on the web.
Julian
-
Julian Stacey Unix Consultant - Munich Germany http://bim.bsn.com/~jhs/
Considering Linux ? Try FreeBSD with its 4200 packages !
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