Sct Command Transport Feature Set - Hitachi HTS542525K9SA00 Specifications

n
n+1
n+2
n+
Counter n
Lenght
...
508
509
510
511
Counter n Identifier
Phy event counter identifier that corresponds to Counter n Value. Specifies the particular event counter that is being
reported. The Identifier is 16 bits in length.
Valid identifiers are listed in Table 68.
Counter n Value
Value of the Phy event counter that corresponds to Counter n Identifier. The number of significant bits is determined
by Counter n Identifier bits 14:12 (as defined in section 4.3.2). The length of Counter n Value shall always be a
multiple of 16-bits. All counters are one-extended. For example, if a counter is only physically implemented as 8-
bits when it reaches the maximum value of 0xFF, it shall be one-extended to 0xFFFF. The counter shall stop (and
not wrap to zero) after reaching its maximum value.
Counter n Length
Size of the Phy event counter as defined by bits 14:12 of Counter n Identifier.
The size of the Phy event counter shall be a multiple of 16-bits.
Data Structure Checksum
The data structure checksum is the 2's complement of the sum of the first 511 bytes in the data structure. Each byte
shall be added with unsigned arithmetic and overflow shall be ignored. The sum of all 512 bytes of the data structure
will be zero when the checksum is correct.
Reserved All reserved fields shall be cleared to zero

10.22 SCT Command Transport Feature Set

SMART Command Transport (SCT) is the method for the drive to receive commands using log page E0h and
transporting data using log page E1h. These log pages are used as follows:
Write log page
Read log page
Counter n Identifier
Counter n Value
Reserved
Data Structure Checksum
Log page E0h Log page E1h
Issue Command Send Data to the drive
Return Status Received Data from the drive
Deskstar 7K160 Hard Disk Drive Specification
107