Deskstar T7K500 Hard Disk Drive Specification
177
The host should base its calculations on the larger of its Typical Host Interface Sector Time and the device reported
Sector Time values, and on the sum of the device reported Access Time values and any additional latency that only
the host is aware of (e.g. host command overhead, etc.).
Table 104: Streaming Performance Parameters log
Table 105: Sector Time Array Entry (Linearly Interpolated)
Table 106: Access Time Array Entry (Linearly Interpolated)
Description
Bytes
Stream Perforamnce Parameters log version
2
K, Number of Regions in Sector Time Array
2
L, Number of Positions in Position Array
2
M, Number of Position-differences in Access T
ime
Array
2
Sector Time Array
K*8
Position Array
L*8
Access Time Array
M*4
Reserved
Description
Bytes
LBA of reference location (LBA(7:0)...LBA(47:40))
n-(n+5)
(Identify Device words (99:98))/65536 time units per sector at the reference location
(n+6)-(n+7)
Description
Bytes
Difference in position from last stream access to new stream access
n-(n+1)
Time that may be required to begin access at new stream access position, in
(Identify Device wirds (89:88))/256 time units
(n+2)-(n+3)
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