Command Specifications

If only the "Block descriptor" in this command is changed, the IDD changes the values in the "Sector count/track," Data byte length/physical sector," "Track skew factor" and "Cylinder skew factor," as well as the "Cylinder count" value in the drive parameters (Page

4)in accordance with the contents specified in the "Block descriptor," and uses the "Current" values as is for the other parameters.

Data block count

This field specifies the total number of logical data blocks (the block length is specified in "Data block length) allocated in the user space on the disk media. The maximum logical block address is a value with 1 subtracted from the value in this field.

The "Data block count" has an intimate relationship with the specifications on Pages 3 and 4.

If only the "Block descriptor" in this command is changed accessible data block count can be limited without formatting if "Data block count" value is within a "Cylinder count" value of page 4. "Cylinder count" value is not changed until the IDD is formatted. If a value exceeding the data block count obtaining from the "Cylinder count" of page 4 is specified, the "Cylinder count" on Page 4 is set to a realizable cylinder count which takes into account the "Alternate track count/drive" and "Alternate sector count/zone" components in Page 3 resulting from the value specified here (no rounding processing report is made). If this cylinder count exceeds the maximum cylinder count that can be use as the user space, the "Data block count" is rounded to the maximum value that is realizable. (There is a rounding processing report in this case).

If zero is specified for the "Data block count," or when the block descriptor is not specified, the IDD retains its current capacity, if the block size or alternate sector count has not changed. If the "Data block count" is set to zero and the Data block size or alternate sector count has changed, the IDD shall set to its maximum capacity when new block size or alternate sector count to be effect.

Data block length

This field specifies the byte length of a logical data block on the disk media.

The logical data block length and physical data block length are the same in the IDD. The data block length can be specified at 512 to 528 bytes (4-byte boundary).

If less than 512 bytes is specified in this field, the IDD performs rounding processing (there is a rounding processing report), setting the data block length at 512 bytes. If more than 528 bytes is specified, rounding processing is performed (there is a rounding processing report), setting the data block length at 528 bytes. If the number except the multiple of 4 is specified within this range, the number is rounded up at the multiple of 4 that is closest to the specified number. (Rounding processing is reported.)

If zero is specified in this field, the value specified in bytes 12 and 13 (Data byte length/sector) of Page 3 (Format Parameter) is set. At that time, if Page 3 is not specified at the same time, the current value in Page 3 is used.

If the value set in this field differs from the value specified in bytes 12 and 13 (Data byte length/sector) of Page 3 (Format Parameter), the data block length in the block descriptor is set.

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Fujitsu MAP3147, MAP3367, MAS3735, MAP3735, MAS3367 specifications Command Specifications

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.