Hitachi hard disk drive specifications
133
Word
Content
Description
88
0x7FH
Ultra DMA Transfer modes
15- 8(=xx)
Current active Ultra DMA transfer mode
15
Reserved (=0)
14
Mode 6
1 = Active
0 = Not Active
13
Mode 5
1 = Active
0 = Not Active
12
Mode 4
1 = Active
0 = Not Active
11
Mode 3
1 = Active
0 = Not Active
10
Mode 2
1 = Active
0 = Not Active
9
Mode 1
1 = Active
0 = Not Active
8
Mode 0
1 = Active
0 = Not Active
7- 0(=7F)
Ultra DMA transfer mode supported
7
Reserved (=0)
6
Mode 6
1 = Support
5
Mode 5
1 = Support
4
Mode 4
1 = Support
3
Mode 3
1 = Support
2
Mode 2
1 = Support
1
Mode 1
1 = Support
0
Mode 0
1 = Support
89
xxxxH
Time required for security erase unit completion
Time= value(xxxxh)*2 [minutes]
90
0000H
Time required for Enhanced security erase completion
91
0000H
Current Advanced power management value
92
FFFEH
Current Password Revision Code
93
0000H
COMRESET result
94
0000H
Reserved
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.
Table 85 Identify device information --Continued--
Содержание Deskstar 7K3000 HDS723015BLA642
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