24 Aug
2012
24 Aug
'12
4:51 p.m.
On 08/24/2012 05:37 PM, Chuck Guzis wrote:
> While a glitch can wipe out a whole track, at least MS-DOS may allow
> one to recover the files based on the FAT contents (assuming that it
> doesn't share the same track as the directory), losing the directory
Ah! But on the early disks, until the FAT got REALLY big and bloated, the
FAT and the firsst sectors of the DIRectory (the parts most heavily used),
were on the same track. It's LOTS more fun salvaging data when the FATs
AND the first sectors of the directory went at the same time.
On Fri, 24 Aug 2012, allison wrote:
Same issue for MSdos, though that was FAT and there
was a secondary fat.
But, the secondary copy of the FAT was always contiguous to the primary
copy, therefore, WHEN it trashed the FAT, it could do in the secondary
copy in the same write, and not have to waste any additional time.
I don't recall ever encountering any situations where MS-DOS would
actually replace the primary copy with the secondary one in cases of
damage.
PS: Thanks, Allsion for the detailed history. Frankly, I don't think that
your adventures were in any way a waste!
--
Grumpy Ol' Fred cisin at xenosoft.com