Command Specifications

 

Bit

7

6

 

5

4

3

2

 

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Cylinder No. (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

Cylinder No.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

Cylinder No. (LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

Head No.

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

Physical sector No. of defective block

(MSB)

 

 

 

 

 

 

 

 

 

 

5

 

 

Physical sector No. of defective block

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

Physical sector No. of defective block

 

 

 

 

 

 

 

 

 

 

 

7

 

 

Physical sector No. of defective block

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3.15 Defect descriptor: physical sector address format

•Cautions in specifying the D list

The P List, containing defect position information, is always recorded on the IDD when it is shipped from the factory. Also, information on defect positions for which alternate block processing has been implemented during operation are recorded as the G List. The function which specifies defect position information as the D List when the FORMAT UNIT command is executed, is prepared mainly to specify initial defect position information of the disk media which does not have the P List recorded on it. In the IDD, by specifying use of the P List and G List, advance notice of the defect positions can be specified during initialization, so ordinarily, it is not necessary to use the D List. When the D List is used for the IDD, caution should be exercised in the follow points.

1.The maximum number of defective sectors (total amount of 'sector slip' and 'alternate sectors') are calculated per :

a)Current condition of reallocated sectors:

(how many Slip Sectors have been allocated ? and so Alternate Sectors ? Since Defect table entry for Slip and Alternate are different size.)

b)The maximum size of Defect Management Table (Fixed value)

c)Current allocation condition of 'sector slip'

(i.e. Up to 16 consecutive Slip Sector can be controlled by 1 Slip Defect entry. So the necessary table size are varied not only the number of Defects but also the number of consecutive Slips.)

Consequently, the concrete Defect numbers cannot be described though the IDD guarantees 12,000 Slip Sectors and 3,000 Alternate Sectors at minimum. If defect processing which exceeds this limit is specified in the FORMAT UNIT command, that command is terminated with a CHECK CONDITION status (HARDWARE ERROR [=4] / No defect spare location available [=32-00]).

2.A defect descriptor specified as the D List are received normally if the specified defect position information is within a range which does not exceed the disk drive’s physical

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Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 specifications Defect descriptor physical sector address format
Page 143 Page 145

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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