6.4.1Spare area

Following two types of spare area are provided in the user space.

1)Spare sector for sector slip:

used for alternating defective sectors at formatting in shipment in case that a physical track contains one or two defective sectors (2 sectors/track)

2)Spare cylinder for alternative assignment:

used for alternative assignment for the third and subsequent defective sectors in case that a physical track contains three or more defective sectors, and also used by automatic alternative assignment. (2 cylinder/drive)

6.4.2Alternating defective sectors

The two alternating methods described below are available:

(1)Sector slip processing

A defective sector is not used and is skipped and a logical sector address is assigned to the subsequent normal sector (physically adjacent sector to the defective sector).

When defective sector is present, the sector slip processing is performed in the formatting. Figure 6.7 shows an example where (physical) sector 5 is defective on head 0 in cylinder 0.

Index

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sector (physical)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

 

6

7

8

 

298406

 

 

407299

 

 

34008

 

 

 

 

Cylinder 0

 

 

 

 

 

 

 

Defective

 

 

 

 

 

 

 

 

 

 

 

 

SP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Head 0

 

 

 

 

 

 

 

sector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

 

 

 

5

6

7

405

 

406

 

 

 

 

 

 

 

 

 

 

 

 

 

Sector (logical)

unused

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If an access request to sector 5 is specified, the device accesses physical sector 6 instead of sector 5.

Figure 6.7 Sector slip processing

C141-E077-01EN

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Image 178
Fujitsu MPE3XXXAT manual Spare area, Alternating defective sectors

MPE3XXXAT specifications

The Fujitsu MPE3XXXAT series is a robust line of hard disk drives (HDDs) known for their reliability, performance, and advanced technology. Designed primarily for enterprise storage solutions, these drives cater to high-demand environments such as data centers, servers, and workstations. With capacities ranging from hundreds of gigabytes to several terabytes, the MPE3XXXAT series offers scalable storage options to accommodate a variety of applications.

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The Fujitsu MPE3XXXAT series is built with advanced technologies that enhance durability and longevity. Notably, the drives incorporate advanced error correction algorithms and vibration resistance features, which are crucial for maintaining data integrity over time. This is particularly important in multi-drive environments where vibrations from one drive can affect the performance of others. The drives are also designed with low power consumption in mind, contributing to energy savings without compromising performance.

In terms of data security, the MPE3XXXAT series supports various security features that protect against unauthorized access. These include ATA security features that enable password protection and robust encryption to safeguard sensitive information from potential breaches. This aspect is particularly significant for enterprises that handle confidential data and require stringent security measures.

The operational temperature range of the MPE3XXXAT drives is optimized for demanding environments, allowing them to function effectively in a variety of conditions. Their reliability is backed by an impressive Mean Time Between Failures (MTBF), which signifies their resilience and the manufacturer's commitment to quality.

Overall, the Fujitsu MPE3XXXAT series stands out as a reliable choice for enterprise storage needs. With its blend of high speed, capacity, durability, and security features, it addresses the challenges faced by modern data centers and businesses that require efficient data management solutions. Whether for backup, archival, or active data storage, the MPE3XXXAT series is designed to deliver consistent performance and peace of mind for users.