3.2 Data Access Commands

When this bit is "1", it indicated that the IDD shall access the media in performing the command prior to returning GOOD status. WRITE commands shall not return GOOD status until the logical blocks have actually been written on the media (i.e., the data is not write cached).

3.2.5WRITE AND VERIFY (2E)

 

Bit

7

6

5

 

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

X‘2E’

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

LUN

 

 

⋅

 

0

 

0

BytChk

0

 

 

 

 

 

 

 

 

 

 

2

 

 

 

Logical Block Address (MSB)

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

5

 

 

 

Logical Block Address (LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

0

0

0

0

0

 

0

0

0

 

 

 

 

 

 

 

7

 

 

 

Transfer Block Count (MSB)

 

 

 

 

 

 

 

 

 

8

 

 

 

Transfer Block Count (LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

0

0

0

0

0

 

0

0

Link

 

 

 

 

 

 

 

 

 

 

 

 

 

This command transfers the number of blocks of data specified in the "Transfer block count" field from the INIT and writes them in continuous logical data blocks with the logical data block on the disk media specified in the "Logical block address" field in the CDB as the top, then reads those data and performs a Verify check.

The functions of this command related to write operations are the same as those of the WRITE EXTENDED command (Section 3.2.4), with the exception that the write cache function cannot be applied. When zero is specified in the "Transfer block count," this command is terminated normally without performing seek or pre-fetch.

The specification in bit 4 of CDB byte 1 is disabled in the IDD and the specified value is disregarded.

If "1" is specified in bit 1 of CDB, the BytChk bit, the IDD writes the transferred data (A) onto the disk media, then compares the data read from the disk media with the data (A). If the data do not match during this mode, the command is terminated with a CHECK CONDITION status (MISCOMPARE [=E] / Miscompare during Verify Operation [=1D-00]).

The IDD does not support this bit. And if "1" is specified in this bit, the IDD reports CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in CDB [=24-00]).

The Verify check executed by this command is the ECC (data portion) normalcy check only. error recovery processing when the verify check is executed is according to the mode specified by the MODE SELECT parameters (Verify error recovery parameter). For example, if data correction

C141-E167

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Page 131
Image 131
Fujitsu MAP3147, MAP3367, MAS3735, MAP3735, MAS3367 specifications Write and Verify 2E
Page 130 Page 132

MAP3735, MAP3147, MAS3367, MAP3367, MAS3735 specifications

Fujitsu, a renowned leader in technology and innovation, has developed a variety of reliable hard disk drives (HDDs) that cater to a wide range of data storage needs. Among these, the MAS3735, MAP3367, MAS3367, MAP3147, and MAP3735 series stand out for their advanced features and exceptional performance.

The MAS3735 is a high-capacity enterprise-class drive that boasts a storage capacity of up to 300 GB. Its 10,000 RPM spindle speed ensures rapid data retrieval and efficient performance, making it ideal for data-intensive applications. It utilizes a Serial Attach SCSI (SAS) interface, which allows for improved data transfer rates and increased reliability compared to traditional SATA drives. The drive is designed with advanced technologies such as error recovery and data integrity features, ensuring the safety and security of critical data.

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On the other hand, both MAP3147 and MAP3735 models provide versatile solutions for various applications, supporting capacities from 36 GB to 147 GB. The MAP3147, with its 10,000 RPM speed, is optimized for workloads requiring quick access and high throughput, making it suitable for transactional systems and enterprise applications. The MAP3735, while offering comparable capacity, emphasizes exceptional reliability and durability, which is crucial for environments that involve heavy data loads.

All these Fujitsu HDDs are characterized by their robust construction, reliability, and efficiency. They are built to withstand heavy workloads and are equipped with features like advanced thermal management and acoustic noise reduction, ensuring they operate effectively in data center environments.

In conclusion, Fujitsu's MAS3735, MAP3367, MAS3367, MAP3147, and MAP3735 series HDDs are designed for high performance and reliability, catering to both enterprise and mid-range environments. Their advanced features make them a strong choice for businesses looking to enhance their storage solutions while maintaining data integrity and system performance.
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