3.2 Data Access Commands

3.2.3

WRITE (0A)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

7

6

5

 

4

 

3

 

2

1

 

0

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

X‘0A’

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

LUN

 

 

 

Logical Block Address (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

Logical Block Address

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

Logical Block Address (LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

Transfer Block Count

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

0

0

0

0

0

 

0

0

 

Link

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This command transfers the number of blocks of data specified in the "Transfer block count" field from the INIT and writes them in continuous logical data blocks with the logical data block on the disk media specified in the "Logical block address" field in the CDB as the top.

The transfer block count can be specified up to a maximum of 256 logical data blocks. When zero is specified in the "Transfer block count" field in byte 4 of the CDB, it specifies transfer of 256 logical data blocks and when a value other than zero is specified, it specifies the number of logical data blocks that should be transferred.

When transfer of multiple data blocks is instructed by this command, when the data blocks which are to be processed come to a track boundary, cylinder boundary or zone boundary, a head switch or cylinder switch is executed automatically and writing of the specified number of blocks is performed.

When the specifications in the "Logical block address" field and "Transfer block count" field in the CDB exceed the maximum logical block address in the IDD, that command is terminated with a CHECK CONDITION status (ILLEGAL REQUEST [=5] / Logical block address out of range [=21- 00]) and writing of data to the disk media is not executed.

The IDD does not perform data transfer immediately after receiving the CDB, but after performing automatic disconnect processing once, it executes pre-fetching of data. If disconnect processing is permitted, the IDD either completes transfer of all the data specified in the command or, at the point when the empty space in the data buffer runs out, disconnect processing is executed. Positioning of the specified data blocks is performed in parallel with this data transfer, and writing of data from the data buffer to the disk media is executed immediately after positioning is completed. See Section

2.1"Data Buffer" for details of data buffer operation and control of the timing for starting reconnection processing by the MODE SELECT parameter (buffer empty ratio).

If the write cache function is enabled, the IDD reports a status byte at the point when reception of all the data transferred from the INIT is completed. If an error occurs while data are being written to the disk media, a CHECK CONDITION status is reported for the command to be executed next. If the write cache function is disabled, a status byte is reported after writing to the disk media of all the data transferred from the INIT is completed, then execution of the command is terminated.

C141-E167

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Image 129
Fujitsu MAS3367, MAP3367, MAP3147, MAS3735, MAP3735 specifications Write 0A
Page 128 Page 130

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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