Hitachi HTS541612J9SA00, HTS541640J9SA00 Deviations from Standard, Physical Interface, Registers

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 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.

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

Features

Features (exp)

Sector count

Sector count (exp)

Sector number

Sector number (exp)

Cylinder low

Cylinder low (exp)

Register name in this specification when writing registers

Feature current

Feature previous

Sector count current

Sector count previous

LBA low current

LBA low previous

LBA mid current

LBA mid previous

Register name in this specification when reading registers

Sector count HOB=0

Sector count HOB=1

LBA low HOB=0

LBA low HOB=1

LBA mid HOB=0

LBA mid HOB=1

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