5.3 Disk Drive Error Recovery Processing

Sectors to be made AWRE shall be following:

•the sector where the error occurs and the latter sectors and,

•the sectors whose data are logically continual and stored in Cache,

•the sectors which will be processed in this Write command and,

•the sectors which locate between erroneous Servo –1 and +1 (including Split sector)

This function is also applied for the sector which has already been re-assigned.

Remark:

1.When a write protection is prohibitted through the setting terminal, the auto alternate block allocation processing specification is disabled.

5.3.3Error recovery processing control

The INIT can, by specifying the MODE SELECT parameters, can control the error recovery processing (retries) of the IDD with respect to each type of error related to the disk drive.

Table 5.5 shows the types of error and the method of specifying the number of retries for those errors. for those items where the INIT can specify the number of retries, normally, it is recommended that the default value or a greater number of times be specified. If a value smaller than the default value is specified, and commands are terminated abnormally without error recovery processing succeeding, the INIT should reset the corresponding MODE SELECT parameters at the default value, then reexecute the original commands.

The MODE SELECT parameters related to disk drive error recovery processing which the INIT can specify are shown below. See the description of the MODE SELECT command (Section 3.1.5) concerning details of the functions of each parameter. The INIT can issue the MODE SELECT or MODE SELECT EXTENDED command as necessary and select the error recovery flags and the number of retries.

a.Read/Write Error Recovery Parameters (Page Code = 1)

• AWRE (automatic write reallocation enabled)

• ARRE (automatic read reallocation enabled)

• TB (transfer block)

• EER (enable early recovery)

• PER (post error)

• DTE (disable transfer on error)

• DCR (disable correction)

• Number of retries during read (See Table 5.5)

• Number of retries during write (See Table 5.5)

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Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 specifications Error recovery processing control
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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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