home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.hp
- Path: sparky!uunet!mcsun!sun4nl!alchemy!prisma!fred
- From: fred@cv.ruu.nl (Fred Appelman)
- Subject: Re: Recovering from disk with bad blocks
- Message-ID: <1992Aug18.192340.15785@cv.ruu.nl>
- Date: Tue, 18 Aug 1992 19:23:40 GMT
- References: <Bt6ryz.Iq2@knot.ccs.queensu.ca>
- Organization: University of Utrecht, 3D Computer Vision Research Group
- Lines: 25
-
- In <Bt6ryz.Iq2@knot.ccs.queensu.ca> heisz@sparky.uucp (Jeff Heisz) writes:
- >CANNOT READ BLCK ##:
- >
- >the diagnositc is: this never happens. if it does consult a guru.
- >
- >The information on this disk is precious to the nth degree. It is not
- >backuped (of course, else why would I ask you this). Any ideas on
- >recovering the info? It is the SCSI disk for one of HPs and so the
- >OS is HP-UX.
-
- Unreadable blocks are caused by media errors and are NEVER readable. There
- is nothing you can do about it. However if you want to read the
- good blocks and save what is left there is a work around. The data must be
- really precious. What you need is a new disc identical to the one that
- crashed, and create a file system on that new disc.
- You have to write a small 'C' program (Which I can provide you
- from the time that I needed it) and read all the blocks that you can still read
- and write it and the same position on the new disc. For both the read and
- the write disc you have to use the raw device and the discs MUST not be
- mounted. After you have done that you have to fsck the new disc.
- Mount the new disc and see what is left.
-
- Fred
-
-
-