[cctalk] Re: long lived media (Was: Damage to CD-R from CD Sleeve

[Paul Koning via cctalk]

> On Jan 17, 2023, at 3:34 PM, P Gebhardt via cctalk <cctalk@classiccmp.org> 
> wrote:
> 
> 
> Am Dienstag, 17. Januar 2023 um 15:54:54 MEZ hat Paul Koning via cctalk 
> <cctalk@classiccmp.org> Folgendes geschrieben: 
> 
> ...
>> I have an RM03 pack somewhere.  There probably are a few places left that 
>> could read it.  If it were an RA60 pack it would be a whole lot more 
>> problematic, I suspect.  Without an >old drive, how would you recover the 
>> data?  Spin table?  Perhaps, if you can find, or reverse engineer, the 
>> format.
> 
> Do you assume the problem with RA60 disk packs to be more problematic because 
> of a smaller availability of systems with RA60 drives to read the packs 
> compared to CDC 9762 /RM03 drives?

Yes, and the higher density, and the fact that the on-disk format is more 
complex and unlikely to be documented in any open documentation.

        paul