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 MAP3147, MAP3367, MAS3735, MAP3735, MAS3367 specifications Disk Media Management, Defect Management
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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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