Hitachi 7K320 Specifications - Page 44

9 Deviations from Standard 7K320 SATA OEM Specification The device conforms to the referenced specifications, with deviations described below. The interface conforms to the Working Document of Information Technology, AT Attachment 8 - ATA/ATAPI Command Set (ATA/ATAPI8-ACS) Revision 3f dated 11 Dec. 2006, with deviation as follows: S.M.A.R.T. Return Status S.M.A.R.T. RETURN STATUS subcommand does not check advisory attributes. That is, the device will not report threshold exceeded condition unless pre-failure attributes exceed their corresponding thresholds. For example, Power-On Hours Attribute never results in negative reliability status. Check Power Mode Check Power Mode command returns FFh to Sector Count Register when the device is in Idle mode. This command does not support 80h as the return value. Security command Actions If Security Disable Password or Security unlock command is issued when in Security State SEC1, the drive responds with "Command Abort". Master Password Revision The valid Revision Codes are 0001h to FFFEh. Default Master Password Revision code Code is FFFEh. Value 0000h and FFFFh is reserved. 10 Physical Interface Physical Interface is described in Functional Specification part. 11 Registers In Serial ATA, the host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the Shadow Register Block. Shadow Register Block registers are interface registers used for delivering commands to the device or posting status from the device. About details, please refer to the Serial ATA Specification. In the following cases, the host adapter sets the BSY bit in its shadow Status Register and transmits a FIS to the device containing the new contents.  Command register is written in the Shadow Register Block  Device Control register is written in the Shadow Register Block with a change of state of the SRST bit  COMRESET is requested Page 44 of 176