IP: CPRM FAQ

[Dave Farber <farber () cis upenn edu>]

> To: Dave Farber <farber () cis upenn edu>
> cc: Jeff.Hodges () kingsmountain com
> From: Jeff.Hodges () kingsmountain com
>
> Everything you ever wanted to know about CPRM, but ZDNet wouldn't tell you...
> Posted: 29/12/2000 at 09:07 GMT
> http://www.theregister.co.uk/content/2/15718.html
>
>
>                                  :
>                                  :
> 10. IBM and Intel say that The Register's story mistakenly assumes that
> CPRM is intended for fixed hard disks, whereas it's only intended for
> removable media. Is this true?
>
> Not if you examine the ATA extensions under consideration closely.
>
> FACT: The CPRM ATA call interface requires information that standard ATA hard
> disks need, but that packet based removable ATAPI drives such as Zip and Jaz
> drives,don't: such as sector start and offset information. If the CPRM 
> proposal
> under consideration by T.13 was for packet-based ATAPI drives, it wouldn't 
> need
> this information.
>
> FACT: We know of only one removable ATA drive: Castlewood's Orb. All others
> use ATAPI, or media-specific extensions on top of ATA (as with IBM's
> Microdrives) - that don't require extensions to the ATA command set.
>
> > From our conversations with the people behind the proposal, and public
> documents released by the T.13 committee, we'll agree that their focus to date
> has been on removable drives, and it's apparent that not all of the 
> consequences
> of CPRM in fixed-drives have been discussed.
>
> But unforeseen or not - and despite public protestations of their good 
> intentions - the 4C Entity is delivering a solution tailor-made for fixed 
> disk ATA drives, and building right into the specification for industry 
> standard fixed drives. This is indisputable.
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