This function is applied once only during execution of one command. Alternate block allocation processing and copying are executed for the first defective data block to be detected during execution of a command, but if a second defective data block is detected, the command that is being executed at that point is terminated with an error. However, by the INIT's reissuing the same command, auto alternate block allocation is applied sequentially and error recovery can be attempted.

Remark:

1.When this function is specified (ARRE = "1"), the EER flag's specification in the MODE SELECT parameter is made invalid and Read retry processing is performed up to the number of times specified in the "Number of Retries during Read" parameter. If "0" is specified in the DCR flag, correction processing of the data is performed afterward (see Section 5.3.1 (3)). When "1" is specified in the DCR flag, ECC correction processing is prohibited, so even if "1" is specified in the ARRE flag, auto alternate block allocation processing will not be executed for errors in the data area.

2.When errors in the data area are recovered from by ECC correction processing, before implementing alternate block allocation processing, rewriting of the recovered data and a verify check (rereading) are performed. If data are recovered by rewriting, alternate block allocation of that data block is not performed.

3.When a write operation is prohibited through the setting terminal, the auto alternate block allocation processing specification is disabled.

(2)Auto alternate block allocation processing during a write operation

This function is enabled by specifying "1" in the AWRE flag in the MODE SELECT parameters. Furthermore, this function is applicable to the following commands only.

•WRITE command

•WRITE EXTENDED command

•WRITE AND VERIFY

When this function is permitted, if, during read processing to the data area, up to 8 unrecoverable read errors will be logged by the drive. The log will be checked before every WRITE command.

If a WRITE command has the same LBA in the log, then Sector Size +2 bytes of data will be written to the sector, and it will be verified with less powered ECC. If the verify is successful, then the AWRE will not be performed. (no sense will be reported).

If the verify is unsuccessful, then check the spare. Write the data onto the new spare, and verify it. If the verify is successful, then the reallocation will be proceeded. If the verify is unsuccessful, then the drive will add the defective spare onto the G-List, and then choose another spare, and try the same thing to the new spare until the verify completes successfully. After reallocates all of the logged LBA included in a WRITE command the drive will start the write operation.

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Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Remark
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MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives represent a significant advancement in storage technology, catering to the needs of businesses seeking reliability, performance, and high capacity. These drives are designed for enterprise environments, providing exceptional data integrity and speed essential for effective data management.

The MAN3184 series is renowned for its high rotational speed of 10,000 RPM, which significantly enhances data access times. With a capacity of up to 18.4 GB, these drives are suitable for applications requiring quick read and write operations. The series employs an improved read/write head technology, which reduces latency and increases overall performance. This technology is complemented by advanced error correction mechanisms, ensuring the reliability necessary for critical data applications.

Transitioning to the MAN3367 series, these drives offer increased storage capacity and improved performance metrics. With capacities reaching up to 36.7 GB, they cater to growing data demands in modern enterprises. They also feature a 10,000 RPM spindle speed, ensuring that the drives can handle intensive workloads with ease. The MAN3367 drives include SCSI interface support, making them versatile and easy to integrate into various systems. The inclusion of intelligent caching algorithms allows for faster data retrieval, while built-in thermal management features ensure optimal performance, even under heavy usage.

The MAN3735 series takes performance up another notch, boasting higher capacities of up to 73.5 GB. These drives are particularly suited for environments that require high reliability and availability. The series utilizes a state-of-the-art SCSI Ultra160 interface, which maximizes data transfer rates, ultimately enhancing overall system efficiency. Additionally, the MAN3735 series employs advanced data protection technologies, including power loss protection and predictive failure analysis, which proactively minimizes potential downtime.

All these series of Fujitsu disk drives are built with a focus on durability and sustained performance. They are designed to operate seamlessly in high-demand environments, ensuring that organizations can rely on them for critical applications. Their compact design and energy-efficient operation make them an ideal choice for modern data centers looking to optimize space and reduce power consumption.

In summary, Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives deliver a blend of high capacity, performance, and reliability. These drives incorporate advanced technologies that address the evolving needs of enterprise storage solutions, making them a valuable asset for any organization aiming to enhance their data management capabilities.
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