3.3 Format Commands

The logical block address of defective data blocks is described in 4-byte format in the defect descriptor. When multiple defect descriptors are specified, it is best for the INIT to describe defect descriptors in the ascending order of the logical data block addresses.

Furthermore, if the addresses of logical data blocks specified in the defect descriptor list overlap each other, This command is terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in parameter list [=26-00] and none of the alternate block allocation processing in that command is executed.

The IDD allocates alternate blocks to the specified data blocks in order from the top of the defect descriptor list. When all the usable spare sectors have been used up, and it is impossible to allocate alternate blocks, execution of this command is terminated at that point and a CHECK CONDITION status is reported. The sense data at this time indicate the following contents.

• Sense key:

4 = HARDWARE ERROR

•

Sense code/Sub-sense code:

32-00 = No defect spare location available

• “VALID” bit:

“1”

•

Information field

Logical block address specified in the defect descriptor

 

 

at the point when alternate block allocation becomes

 

 

impossible.

•

Command inherent information field

Also, when this command is terminated abnormally with a CHECK CONDITION status due to any one of several other types of error besides the above error, the logical block address specified in the first defect descriptor which did not undergo alternate block allocation is reported in the “Command inherent information” field in the sense data. However, if alternate block allocation processing of the defect descriptors for which alternate block allocation has not been implemented cannot be specified, or if alternate block allocation of all the specified defect descriptors has been completed, the “Command inherent information” field indicates X ‘FFFFFFFF.’

When alternate block allocation processing is successful, the defect position information on the disk media related to the data blocks specified in the defect descriptor list is recorded on the disk media as the defect list (G List). The INIT can read the contents of the G List using the READ DEFECT DATA command. Also, this command has no influence on the contents of the primary defect list (P List).

Note:

The defect position information in the G List is physical block addresses (logical data block addresses are allocated when no defect exists on the disk media). Therefore, the values specified in this command’s defect descriptor list (logical block addresses) may not necessarily be the same as the contents of the G List read by the READ DEFECT DATA command after this command is terminated. For details, see the description of the READ DEFECT DATA command (Section 3.3.3).

Note: Precautions for use of command

If this command is terminated with a CHECK CONDITION status, the sense code/sub-sense code in the sense data is other than “No defect spare location available [=32-00], and a valid logical block address (other than X ‘FFFFFFFF’) is displayed in the “Command inherent information” field, it is necessary for the INIT to reissue this command by the following procedure after executing recovery processing (shown in Section 5.2) in accordance with the contents of the sense data.

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Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 specifications = Hardware Error
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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.

Similarly, the MAP3367 and MAS3367 models are geared towards both enterprise and mid-range server environments, providing a storage capacity of up to 300 GB as well. These drives also operate at a spindle speed of 15,000 RPM, offering swift access times that enhance overall system performance. The MAP3367 employs the Ultra 320 SCSI interface, allowing for significant bandwidth and ensuring data is transmitted efficiently.

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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