On Tue, 29 Jan 2013 09:07:13 -0500, Francois Labreque wrote:

> Le 2013-01-28 21:43, Jim Henderson a écrit :
>> On Mon, 28 Jan 2013 17:16:16 -0500, Francois Labreque wrote:
>>
>>>> It's a new feature in Windows Server 2007 (?).
>>>
>>> A new feature that Novell had in Netware 3.10 back in 1990.
>>
>> I was thinking the same thing.  That was the migration feature IIRC.
>> Migrated data from fast disk storage to slower optical storage.
> 
> No, I was just thinking of the SALVAGE utility that allowed you to
> restore previous copies of files.  (a bit similar to Norton's UNERASE,
> but that would work on non-contiguous files)

Oh, yes, that was also available on 2.x, I think.

The difference, though, is that there was no guarantee that a prior 
version would still be there.  With SALVAGE, the blocks were marked as 
freeable and the DET entry was moved to DELETED.SAV if the directory were 
removed (I think in some cases it always was moved there, but at some 
point it was just marked in the DET in the directory as deleted until it 
was purged or the blocks were used).

If the blocks the file was stored in were needed for storage, though, 
then the file would be permanently deleted.

Or, obviously, if the PURGE utility were run.

HSM, on the other hand, preserved copies of files on optical media, but 
probably didn't catch all revisions.

Jim

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