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If drive manufacturers are going to continue to use the retired codes and don't ever want to reclaim them, then we should move the definition to obsolete instead of retired. (Obsolete prohibits reclamation) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hale Landis Sent: Wednesday, November 02, 2005 7:03 AM To: T13 List Server Subject: [t13] a comment on some old command codes This message is from the T13 list server. I just want to remind everyone that many drives still implement the old 9xH power management commands. These are alternative command codes for the standard ExH power management command codes and perform the same functions as the ExH command codes. A few things about the old 9xH commands: 1) ATA/ATAPI-7 shows these command codes as 'retired' - that is OK - but taking the next step of making them 'obsolete' and then assigning these codes to some other new function could be a big problem. 2) I see that many drives that implement the 9xH command codes including several very new SATA 2.5 inch drives. 3) Both the 9xH and ExH power management command codes are mandatory for CFA ATA devices. As a minimum action on the part of T13, I would suggest that the old 9xH power management command codes be marked as 'reserved for CFA' (to prevent any problem with future reassignment of the codes to some new function). 4) ATA/ATAPI-7 defines the Unload feature for the E1H IDLE IMMEDIATE command... Here is a question for those of you making drives that implement the old 9xH commands... If the drive supports the E1H IDLE IMMEDIATE Unload feature should I expect the drive will also support the Unload feature when the 95H IDLE IMMEDIATE command code is used? Private or public responses welcome. Hale -- ++ Hale Landis ++ www.ata-atapi.com ++
