ξData 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.

ξData 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 MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications

MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives represent a significant advancement in storage technology, catering to the needs of businesses seeking reliability, performance, and high capacity. These drives are designed for enterprise environments, providing exceptional data integrity and speed essential for effective data management.

The MAN3184 series is renowned for its high rotational speed of 10,000 RPM, which significantly enhances data access times. With a capacity of up to 18.4 GB, these drives are suitable for applications requiring quick read and write operations. The series employs an improved read/write head technology, which reduces latency and increases overall performance. This technology is complemented by advanced error correction mechanisms, ensuring the reliability necessary for critical data applications.

Transitioning to the MAN3367 series, these drives offer increased storage capacity and improved performance metrics. With capacities reaching up to 36.7 GB, they cater to growing data demands in modern enterprises. They also feature a 10,000 RPM spindle speed, ensuring that the drives can handle intensive workloads with ease. The MAN3367 drives include SCSI interface support, making them versatile and easy to integrate into various systems. The inclusion of intelligent caching algorithms allows for faster data retrieval, while built-in thermal management features ensure optimal performance, even under heavy usage.

The MAN3735 series takes performance up another notch, boasting higher capacities of up to 73.5 GB. These drives are particularly suited for environments that require high reliability and availability. The series utilizes a state-of-the-art SCSI Ultra160 interface, which maximizes data transfer rates, ultimately enhancing overall system efficiency. Additionally, the MAN3735 series employs advanced data protection technologies, including power loss protection and predictive failure analysis, which proactively minimizes potential downtime.

All these series of Fujitsu disk drives are built with a focus on durability and sustained performance. They are designed to operate seamlessly in high-demand environments, ensuring that organizations can rely on them for critical applications. Their compact design and energy-efficient operation make them an ideal choice for modern data centers looking to optimize space and reduce power consumption.

In summary, Fujitsu's MAN3184, MAN3367, and MAN3735 series disk drives deliver a blend of high capacity, performance, and reliability. These drives incorporate advanced technologies that address the evolving needs of enterprise storage solutions, making them a valuable asset for any organization aiming to enhance their data management capabilities.