11.56Write Stream DMA (3Ah)

Command Block Output Registers

Register

 

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Data Low

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Data High

 

-

-

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Feature

Current

V

V

V

V

-

V

V

V

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

Cylinder Low

Current

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Cylinder High

Current

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

Previous

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Device/Head

 

1

1

1

D

-

-

-

-

 

 

 

 

 

 

 

 

 

 

Command

 

0

0

1

1

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

 

 

 

 

 

 

 

 

 

 

Cylinder Low

HOB=0

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

HOB=1

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

 

 

Cylinder High

HOB=0

V

V

V

V

V

V

V

V

 

 

 

 

 

 

 

 

 

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

CCTO

 

 

 

 

 

 

 

 

V

0

0

V

0

V

0

V

 

 

 

 

 

 

 

 

Table 177 Write Stream DMA Command (3Ah)

Status Register

7

6

5

4

3

2

1

0

BSY

RDY

SE

DWE

DRQ

COR

IDX

ERR

 

 

 

 

 

 

 

 

0

V

V

0

-

0

-

V

 

 

 

 

 

 

 

 

The Write Stream DMA command allows the host to write data using the DMA data transfer protocol. This command allows for the host to specify to the device that additional actions need to be performed prior to the completion of the command if the required bits are set.

If the Write Continuous bit is set to one, the device shall not stop execution of the command due to errors. If the WC bit is set to one and errors occur in the transfer or writing 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, IDNF, or ABRT, reported in the error log. If the WC 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 Completion Time Limit event if some data transferred is in error.

Hitachi hard disk drive specifications

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Hitachi HDS721032CLA362 Write Stream DMA 3Ah, Write Stream DMA Command 3Ah, Hitachi hard disk drive specifications 246
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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.
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