11.25Read Stream DMA (2Ah)

Command Block Output Registers

Register

 

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Data Low

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Data High

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

Current

V

V

V

V

-

V

V

V

Feature

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Sector Count

Current

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Sector

Current

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

Number

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

 

Current

V

V

V

V

V

V

V

V

Cylinder Low

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

 

Current

V

V

V

V

V

V

V

V

Cylinder High

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Device/Head

 

1

1

1

D

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Command

 

0

0

1

0

1

0

1

0

 

 

 

 

 

 

 

 

 

 

Command Block Input Registers

Register

 

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Data Low

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Data High

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Error

 

 

 

…See Below…

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sector Count

HOB=0

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

HOB=1

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

Sector

HOB=0

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

Number

HOB=1

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

 

HOB=0

V

V

V

V

V

V

V

V

Cylinder Low

 

 

 

 

 

 

 

 

 

HOB=1

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

 

HOB=0

V

V

V

V

V

V

V

V

Cylinder High

 

 

 

 

 

 

 

 

 

HOB=1

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Device/Head

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Status

 

 

 

…See Below…

 

 

 

 

 

 

 

 

 

 

 

 

Error Register

7

6

5

4

3

2

1

0

CRC

UNC

0

IDN

0

ABT

T0N

CCT

O

 

 

 

 

 

 

 

V

V

0

V

0

V

0

V

 

 

 

 

 

 

 

 

Status Register

7

6

5

4

3

2

1

0

BSY

RDY

SE

DWE

DRQ

COR

IDX

ERR

 

 

 

 

 

 

 

 

0

V

V

0

-

0

-

V

 

 

 

 

 

 

 

 

Table 122 Read Stream DMA Command (2Ah)

The Read Stream DMA command reads one to 65536 sectors as specified in the Sector Count register. A value of 0000h in the Sector Count register requests 65536 sectors.

The RC bit indicates that the drive operate in a continuous read mode for the Read Stream command. When RC is cleared to zero the drive shall operate in normal Streaming read mode.

When the Read Continuous mode is enabled, the device shall transfer data of the requested length without setting the ERR bit to one. The SE bit shall be set to one if the data transferred includes errors. The data may be erroneous in this case.

If the Read Continuous bit is set to one, the device shall not stop execution of the command due to errors. If the RC bit is set to one and errors occur in reading or transfer of the data, the device shall continue to transfer the amount of data requested and then provide ending status with the BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to zero, and the type of error, ICRC,UNC,IDNF or ABRT, reported in the error log. If the RC bit is set to one and the Command Completion Time Limit expires, the device shall stop execution of the command and provide ending status with BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to zero, and report the fact that the Command Completion Time Limit expired by setting the CCTO bit in the error log to one, In all cases, the device shall attempt to transfer the amount of data requested within the Command

Hitachi hard disk drive specifications

167

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Hitachi HDS721050CLA662 Read Stream DMA 2Ah, Read Stream DMA Command 2Ah, Hitachi hard disk drive specifications 167
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HCS721016CLA382, HCS721050CLA382, HCS721025CLA382, HDP725050GLA360, HUA722050CLA330/1 specifications

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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.

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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.
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