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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>                                  :



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