Table 91.Identify Device Information (Part 7 Of 7) - Hitachi 7K80 - Deskstar - Hard Drive Specifications

Table 92: Identify device information (Part 7 of 7)
An asterisk (*) in next to the Content field indicates the use of those parameters that are vendor specific
Word Content
94 xxxxH
95 xxxxH
96 xxxxH
97 xxxxH
98-99 xxxxH
100-103 xxxxH
104 xxxxH
105-106 0000H
107 58C5H
108-111 xxxxH
112-126 0000H
127 0000H
Description
Current Automatic Acoustic Management value
15-8 Vendor's Recommended Acoustic Management level
7-0 Current Automatic Acoustic Management value
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.
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.
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.
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.
Maximum user LBA address for 48-bit Address feature set
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.
Reserved
Inter-seek delay for ISO-7779 acoustic testing in microseconds
World wide name
the optional value of the world wide name for the device
Reserved
Removable Media Status Notification feature set
0000H=Not supported
Deskstar 7K80 Hard Disk Drive Specification
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