This message is from the T13 list server.
Mark Overby wrote:
Answers inline below:
[...]
*** The feature set(s) as described in clause 4.19 and 4.20 of ATA-7.
This is more than an "editorial change"... When will the marked up versions of all the changes be available? That is changes to 4.19, 4.20, IDENTIFY data words, PACKET command, SERVICE command, and protocol diagrams, etc.
*** Both are being removed. I agree that removing one made no sense without removing the other. This was voted on at the April 05 plenary meeting and is recorded in the minutes. Curtis Stevens sat in on an MMC meeting in March 05 in Dana Point and there as no objection.
OK. But why remove this just for ATAPI? So what if no one implements it. If this old PATA attempt at 'tagged command queuing' is OK for disk drives why is it not OK for ATAPI devices?
*** I fully disagree that the overlap and queuing feature sets have not been implemented at the host level. I know of 3 hosts I personally have examined that implement this feature set. Queueing and overlap is only being removed for packet command set devices.
Just curious... Why is there no 'NCQ' for ATAPI devices? Is this a continued attempt to 'force' the ATAPI people out of T13 (and SATAIO?) and make them move to other interfaces (like USB) by restricting what they can implement?
Hale -- ++ Hale Landis ++ www.ata-atapi.com ++
