Table 40 Read Log Ext Log Page 11H Data Structure Definition - Western Digital Ultrastar DC HC310 Specifications

9.17.3.3 READ LOG EXT Log Page 11h
READ LOG EXT log page 11h is one page (512 bytes) in length. The first Dword of the log page contains information
that applies to the rest of the log page. Software should continue to process counters until a counter identifier with
value 0h is found or the entire page has been read. A counter identifier with value 0h indicates that the log page
contains no more counter values past that point. Log page 11h is defined in Table 40.
Byte 7
0
1
2
3
...
n
n+1
n+2
n +
Counter
n Length
...
508
509
510
511

Table 40 READ LOG EXT Log Page 11h data structure definition

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 40.
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 Table 39). 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
6 5 4
Reserved
Reserved
Reserved
Reserved
...
Counter n Identifier
Counter n Value
...
Reserved
Data Structure Checksum
Western Digital Hard Disk Drive OEM Specification
3 2 1
68
0