🚀 go-pugleaf

In article <NIX.90Sep16231320@stekt.oulu.fi> nix@stekt.oulu.fi (Tero Manninen) writes:
:I seem to have a nasty problem with my 30M Seagate..
:This began when my other hard disk stopped to work (the 20M drive
:inside A590) and I tried to reformat it.  Accidentally I formatted a
:few cylinders from my healthy scsi disk (not low level format).
:The scsi disk had two partitions in it and both were after that
:"Not a DOS disk" :-(
:So I tried to set partition information back with Supra controller
:(I had not reformatted the disk after I switched to A590 controller).
:But still no luck..
:
:Now when I am trying to recover the files from the second partition
:I get DiskSalv errors (the block difference stays at 202 blocks):
: FILE ":LOOSE-BLOCKS/DIRBLK-20800/indent.doc.Z" Block Key Mismatch:
: 21066 != 20864
:
:With the first partition I get errors like this (diff 102 blocks):
: FILE ":LOOSE-BLOCKS/DIRBLK-10406/Calc" Block Key Mismatch:
: 10332 != 10434

	OK, what it looks like has happened here is you have the break
	between the first partition and the second partition offset by
	a cylinder or two. Take a look at the drive info (blocks/track
	and number of surfaces) to figure out exactly how many cylinders
	they are off from what they're supposed to be. Then use SupraFormat
	to move the ending cylinder on the first partition and the starting
	cylinder on the second partition to reflect this. you should be
	able to reboot and find pretty much everything under a 'normal'
	filesystem. The few cylinders that got formatted won't have data
	on them, and any files that were stored in that area won't be
	recoverable.

	It's also possible that the drive parameters are different between
	the two controller softwares. I know that my Maxtor XT-3280S
	which has 1224 cylinders, 25 sectors/track and 15 surfaces shows
	up on the 3000 as 1310 cylinders, 350 sectors/track and one
	surface. Very close to the same number of total blocks, but
	confusing at times...

:The recovered files are pure garbage.. I suspect that they are 202 and
:102 blocks off the real data.
:Is there any way to change this block offset ?
:I already tried to change disk partitioning but it works by cylinders,
:not blocks..

	Again, tweak the drive parameter info to make a change in the
	nuber of cylinders match the number of blocks you need. The
	drive parameters you come up with don't have to actually match
	the physical drive, since SCSI just works on logical block
	numbers...

:Oh, I was just to forget.. the DiskSalv is v1.42, very nice program.
:
:++Tero


-- 
     -Bill Seymour             ...tektronix!reed!percival!agora!billsey
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