CHAPTER 6 DISK MEDIA MANAGEMENT

6.1Defect Management

6.2Disk Media Initialization

6.3Data Block Verification Methods (Recommended)

6.4Alternate Block Allocation Processing

In this chapter, disk media defect management methods, treatment methods for media defects which occur during operation, reinitialization procedures and other disk media management methods are discussed. Furthermore, see Chapter 3, "Data Format" in the "Product Manual" concerning details of the data recording format on the disk media.

6.1Defect Management

(1)Defect lists

Information on the positions of defects in the disk media are managed by the types of defect list shown below. See the description of the FORMAT UNIT command (Section 3.3.1) concerning methods for using the defect lists.

• P List

Defect position information at the point when the disk drive was shipped from the

 

factory is recorded in this list. The defective portions included in this list are

 

permanent defects, and when the disk media is initialized, it is necessary that this list

 

be used and alternate block processing be executed.

• D List

This list includes defect position information specified by the INIT in the FORMAT

 

UNIT command when initializing the disk media.

• C List

This list contains information on the positions of defective blocks detected during the

 

data block Verify operation (Certification) after initialization by the FORMAT UNIT

 

command. This information is generated internally by the IDD when the FORMAT

 

UNIT command is executed.

• G List

This list is composed from the defective logical data block position information

 

specified by the INIT in the REASSIGN BLOCKS command, defective logical data

 

block position information from alternate blocks which have been allocated by the

 

IDD's auto alternate block allocation processing, information specified as the D List

 

and information generated as the C List.

The P List and G List are recorded in the system space on the disk media. The INIT can read the contents of these lists by the READ DEFECT DATA command.

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Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Disk Media Management, Defect Management
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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.

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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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