Re: ffs can't find superblock

[mortee <mortee.lists%kavemalna.hu@localhost>]

OK, for a start, I decided to make a backup image of the volume, just in
case. So I created a VMware system with a virtual disk (sd0) big enough
to accomodate the full volume to save (sd1).

I created a disklabel on that virtual disk with a partiton of siye
exactly the same. I tried to clone the FS, but this is what I got:

# dd if=/dev/sd1a of=/dev/sd0a
dd: /dev/sd0a: Read-only file system
4+0 records in
3+0 records out
1536 bytes transferred in 0.076 secs (20210 bytes/sec)
# dd if=/dev/rsd1a of=/dev/rsd0a
dd: /dev/rsd0a: Read-only file system
2+0 records in
1+0 records out
512 bytes transferred in 0.011 secs (46545 bytes/sec)

My questions: is there any difference data-wise between using the raw or
block devices? And also why is it failing with that message?

thx
mortee

On 02/04/2011 23:37, David Laight wrote:
> I wouldn't run fsck on that filesystem, it might remove any chance
> of recovering some of the data.
> You need something non-destructive that tries to recover files to
> a different disk.