11.18.4 Command Error

Table 108 defines the format of the Command Error data structure.

Byte

7

6

5

 

4

 

3

 

2

1

0

0

NQ

Reserved

 

 

 

 

TAG

 

 

1

 

 

 

 

Reserved

 

 

 

2

 

 

 

 

 

Status

 

 

 

3

 

 

 

 

 

Error

 

 

 

4

 

 

 

 

Sector Number

 

 

 

5

 

 

 

 

Cylinder Low

 

 

 

6

 

 

 

 

Cylinder High

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

Dev/Head

 

 

 

8

 

 

 

Sector Number Previous

 

 

 

9

 

 

 

Cylinder Low Previous

 

 

 

10

 

 

 

Cylinder High Previous

 

 

 

11

 

 

 

 

Reserved

 

 

 

12

 

 

 

 

Sector Count

 

 

 

13

 

 

 

Sector Count Previous

 

 

 

14 - 255

 

 

 

 

Reserved

 

 

 

256 – 510

 

 

 

 

Vendor Unique

 

 

 

511

 

 

Data Structure Checksum

 

 

Table 108 Command Error information

The TAG field (Byte 0 Bits 4-0) contains the tag number corresponding to a queued command if the NQ bit is cleared.

The NQ field (Byte 0 Bit 7) indicates whether the error condition was a result of a non-queued or not. If it is cleared the error information corresponds to a queued command specified by the tag number indicated in the TAG field.

The bytes 1 to 13 correspond to the contents of Shadow Register Block when the error was reported.

The Data Structure Checksum (Byte 511) contains the 2‟s complement of the sum of the first 511 bytes in the data structure. The sum of all 512 bytes of the data structure will be zero when the checksum is correct.

Hitachi hard disk drive specifications

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Hitachi HDP725050GLA360, HCS721050CLA382, A7K2000 Command Error information, Hitachi hard disk drive specifications 152

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.