Hitachi HTS541680J9SA00 Specifications - Page 44

Travelstar 5K160 (SATA) Hard Disk Drive Specification 9 Deviations from Standard The device conforms to the referenced specifications, with deviations described below. The interface conforms to the Working Document of Information Technology, AT Attachment with Packet Interface Extension (ATA/ATAPI-7) Revision 4b dated 21 Apr. 2004, with deviation as follows: S.M.A.R.T. Return Status Check Power Mode 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 command returns FFh to Sector Count Register when the device is in Idle mode. This command does not support 80h as the return value. 10 Physical Interface Physical Interface is described in "Part1 Functional Specification" section 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 11.1 Register naming convention This specification uses the same naming conventions for the Command Block Registers as the ATA/ATAPI-7 standard. However, the register naming convention is different from that uses in the Serial ATA 1.0a specification. Table 24 defines the corresponding of the register names used in this specification with those used in the Serial ATA 1.0a specification. Serial ATA register name Register name in this specification when writing registers Register name in this specification when reading registers Features Feature current Features (exp) Feature previous Sector count Sector count current Sector count HOB=0 Sector count (exp) Sector count previous Sector count HOB=1 Sector number LBA low current LBA low HOB=0 Sector number (exp) LBA low previous LBA low HOB=1 Cylinder low LBA mid current LBA mid HOB=0 Cylinder low (exp) LBA mid previous LBA mid HOB=1 44/167