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AHCI does not support NCQ on ATAPI devices. It doesn't because that feature isn't defined in the SATA specifications. AHCI specification is publicly available from http://www.intel.com/technology/serialata/ahci.htm - rob -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hale Landis Sent: Wednesday, December 08, 2004 10:47 AM To: T13 List Server Subject: [t13] SATA AHCI ATAPI TCQ (NCQ?) This message is from the T13 list server. Does AHCI support new style TCQ (NCQ?) for ATAPI devices? If not, why not? Are there any other reasons why new style TCQ (NCQ?) can not be supported for ATAPI devices (other than there needs to be a new variation of the PACKET command, probably just another bit in the PACKET Features register) to say use new style TCQ (NCQ?)? Does this first require action/approval of the SATA "secret society" before T13 can discuss it? Hale -- ++ Hale Landis ++ www.ata-atapi.com ++
