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Hard disc recovery

I had a somewhat strange experience today with a hard drive.

Some months ago I decided to upgrade the hard drive on my PC from 100GB to
160GB. The drives were formatted to NTFS.

I used the now spare 100GB drive in my Risc PC, initialising it with my
Unipod, where it has been used since February this year.

As the 100GB was a bit over the top and the PC again needed more space, I
reverted the Risc PC to its original 10GB drive and put the 100GB drive -
still with all the Risc PC stuff on it - back into the PC, as a slave to
the other drive.

When I turned the PC on, it went into a half hour frenzy of reindexing
files and then putting all the 'orphaned files' into directories.

At the end of half an hour the PC finished booting with the second hard
drive - which I took from my Risc PC - completely reinstated with all the
files and folders, including Windows, that it had contained before being
used in the Risc PC.

I'm very impressed and just wish that RISC OS had a disc recovery feature
as effective as that on NTFS.

Cheers,

Ray D
0
Ray6068 (3130)
9/10/2006 5:21:39 PM
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In article <gemini.j5e082001brou01y0.ray@magray.freeserve.co.uk>, Ray Dawson
<URL:mailto:ray@magray.freeserve.co.uk> wrote:
> 
> I had a somewhat strange experience today with a hard drive.
> 
> Some months ago I decided to upgrade the hard drive on my PC from 100GB to
> 160GB. The drives were formatted to NTFS.
> 
> I used the now spare 100GB drive in my Risc PC, initialising it with my
> Unipod, where it has been used since February this year.
> 
> As the 100GB was a bit over the top and the PC again needed more space, I
> reverted the Risc PC to its original 10GB drive and put the 100GB drive -
> still with all the Risc PC stuff on it - back into the PC, as a slave to
> the other drive.
> 
> When I turned the PC on, it went into a half hour frenzy of reindexing
> files and then putting all the 'orphaned files' into directories.
> 
> At the end of half an hour the PC finished booting with the second hard
> drive - which I took from my Risc PC - completely reinstated with all the
> files and folders, including Windows, that it had contained before being
> used in the Risc PC.
> 
> I'm very impressed and just wish that RISC OS had a disc recovery feature
> as effective as that on NTFS.

Some/many of the files may now be corrupt so I'd igore all of them except
any you would otherwise have lost, and each of those will need to be checked
individually.

Chris Evans

-- 
CJE Micro's / 4D                'RISC OS Specialists'
Telephone: 01903 523222             Fax: 01903 523679
chris@cjemicros.co.uk     http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex,     BN11 2EN
The most beautiful thing anyone can wear, is a smile!

0
chris8168 (2937)
9/11/2006 10:08:52 AM
Ray Dawson <ray@magray.freeserve.co.uk> wrote:
> At the end of half an hour the PC finished booting with the second hard
> drive - which I took from my Risc PC - completely reinstated with all the
> files and folders, including Windows, that it had contained before being
> used in the Risc PC.
> 
> I'm very impressed and just wish that RISC OS had a disc recovery feature
> as effective as that on NTFS.

What's probably happened is that when you reformatted it for RISC OS it only
wrote the map, boot sector and root directory, being the minimum structure
for RISC OS to be able to store files on the disc.  By chance these didn't
hit anything that was vital for the NTFS format underneath.  Further by
chance storing the small quantity of files on the disc didn't hit any of
that vital infrastructure either.  So when you put it back in the PC
Windows just noticed a bit of peripheral damage which it patched up.  It
hasn't yet noticed that some of the files have been corrupted because it
doesn't check the interior of every file.  The same might have happened had
you done it the other way around and run DiscKnight on it.

If both NTFS and RISC OS discs had lots of free space the chance of no
catastrophic collisions in this way is quite high - but at some point one
would have trampled a vital structure used by the other and it would then be
unrecoverable.

Theo
0
news539 (2440)
9/11/2006 2:42:21 PM
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