Deskstar T7K500 Hard Disk Drive Specification
156
Table 87: Identify device information
An asterisk (*) in next to the Content field indicates the use of those parameters that are vendor specific
.
Word 94-127 PATA
Word Content Description
94 xxxxH Current Automatic Acoustic Management value
15-8 Vendor's Recommended Acoustic Management level
7-0 Current Automatic Acoustic Management value
95 xxxxH
Stream Minimum Request Size
Number of sectors that provides optimum performance in streaming environment.
This number shall be a power of two, with a minimum of eight sectors (4096 bytes).
The starting LBA value for each streaming command should be evenly divisible by
this request size.
96 xxxxH
Streaming Transfer Time - DMA
The worst-case sustainable transfer time per sector for the device is calculated as
follows:
Streaming Transfer Time = (word 96) * (words(99:98) / 65536)
If the Streaming Feature set is not supported by the device, the content of word 96
shall be zero.
97 xxxxH
Streaming Access Latency - DMA and PIO
The worst-case access latency of the devoce for a streaming command is
calculated as follows:
Access Latency = (word 97) * (words(99:98) / 256)
If the Streaming Feature set is not supported by the device, the content of word 97
shall be zero.
98-99 xxxxH
Streaming Performance Granularity
These words define the fixed unit of time that is used in Identify Device words
(97:96) and (104),and Set Features subcommand 43h, and in the Streaming
Performance Parameters log, which is accessed by use of the Read Log Ext
command, and in the Command Completion Time Limit that is passed in streaming
commands. The unit of time for this parameter shall be in microseconds, e.g. ad
value of 10000 indicates 10 ms.
100-103 xxxxH Maximum user LBA address for 48-bit Address feature set
104 xxxxH
Streaming Transfer Time - PIO
The worst-case sustainable transfer time per sector for the device is calculated as
follows:
Streaming Transfer Time = (word 104) * (words(99:98) / 65536)
If the Streaming Feature set is not supported by the device, the content of word
104 shall be zero.
105-106 0000H Reserved
107 58C5H Inter-seek delay for ISO-7779 acoustic testing in microseconds
108-111 xxxxH
World wide name
the optional value of the world wide name for the device
112-126 0000H Reserved
127 0000H Removable Media Status Notification feature set
0000H=Not supported
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