Word

Content

Description

 

94

0000H

Reserved

 

 

 

Stream Minimum Request Size

95

xxxxH

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

96

xxxxH

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:

97

xxxxH

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

98-99

xxxxH

(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

Total Number of User Addressable Logical Sectors for 48-bit commands

 

 

Streaming Transfer Time - PIO

 

 

The worst-case sustainable transfer time per sector for the device is calculated as follows:

104

xxxxH

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

5A87H

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

 

 

112-118

0000H

Reserved

 

119

4014h

Supported settings (Continued from word 84:82)

 

 

15

Shall be cleared to zero

 

 

14

Shall be set to one.

 

 

13-6

Reserved

 

 

5

0=Free-fall Control feature set is not supported

 

 

4

1=The segmented feature for download microcode is supported.

 

 

3

0=Read and Write DMA Ext GPL optional commands are not supported.

 

 

2

1=Write Uncorrectable is supported.

 

 

1

0=Write-Read-Verify feature set is not supported

 

 

0

Reserved

1204014h Command set/feature enabled/supported. (Continued from word 87:85)

15 Shall be cleared to zero

14 Shall be set to one.

 

 

13-6

Reserved

 

 

5

0=Free-fall Control feature set is disabled

 

 

4

1=The segmented feature for download microcode is supported.

 

 

3

0=Read and Write DMA Ext GPL optional commands are not supported.

 

 

2

1=Write Uncorrectable is supported.

 

 

1

0=Write-Read-Verify feature set is not enabled

 

 

0

Reserved

121-126

0000H

Reserved

 

1270000H Removable Media Status Notification feature set 0000H=Not supported

Table 89 Identify device information --Continued—

Hitachi hard disk drive specifications

130

Page 130
Image 130
Hitachi HDS721025CLA682, A7K2000 Hitachi hard disk drive specifications 130, Reserved Stream Minimum Request Size XxxxH

HCS721016CLA382, HCS721050CLA382, HCS721025CLA382, HDP725050GLA360, HUA722050CLA330/1 specifications

Hitachi's lineup of hard disk drives, including models such as HDS721075CLA632, HDS721032CLA362, HDS721032CLA662, HDS721050CLA362, and DSDS7210C09EN-04, offers a variety of features catering to different storage needs. These drives are widely recognized for their reliability, performance, and efficiency, making them suitable for both consumer and enterprise applications.

The HDS721075CLA632 model, with a capacity of 750GB, strikes a balance between performance and storage capabilities. It operates at 7200 RPM, ensuring quick access to data while maintaining low latency. Its 32MB cache enhances data transfer rates and improves overall system responsiveness. This HDD is particularly useful for gaming, multimedia, and office applications, allowing users to store a substantial amount of data with quick retrieval times.

The HDS721032CLA362 and HDS721032CLA662 share many similarities and are both designed for budget-conscious consumers. With a capacity of 320GB and a 7200 RPM, they offer efficient storage solutions for everyday tasks. The 32MB cache buffer enables efficient caching of frequently accessed files, providing a smooth experience for users.

Another notable model is the HDS721050CLA362, which features a capacity of 500GB. Like its counterparts, this drive operates at a speed of 7200 RPM and utilizes a 32MB cache, which ensures optimal performance for data-heavy applications. This model stands out for its energy efficiency, resulting in lower operational costs, making it an appealing choice for businesses and energy-conscious consumers alike.

On the other hand, the DSDS7210C09EN-04 is a part of Hitachi's enterprise-oriented offerings. This drive is engineered for demanding applications, featuring advanced technologies such as error recovery controls and enhanced data protection features. With a focus on reliability and performance, the DSDS7210C09EN-04 serves well in server environments and for high-performance computing.

Hitachi's hard drives incorporate various technologies that enhance their performance and durability. Features such as staggered start-up, which gradually powers on the drive, help minimize power surges and increase the longevity of the device. Moreover, Hitachi's commitment to quality ensures that each drive undergoes rigorous testing, guaranteeing functionality and reliability.

Overall, the diverse range of models from Hitachi provides effective solutions for anyone from casual users to enterprises, combining storage capacity with advanced technologies to meet the evolving demands of modern data storage.