CHAPTER 3 DATA FORMAT

3.1Data Space

3.2Logical Data Block Addressing

3.3Defect Management

This chapter explains data space definition, logical data block addressing, and defect management on the IDD.

3.1Data Space

The IDD manages the entire data storage area divided into the following three data spaces.

∙User space: Storage area for user data

∙Internal test space: Reserved area for diagnostic purposes

∙System space: Area for exclusive use of IDD itself

The user space allow a user access by specifying data. These space can be accessed with the logical data block addressing method described in Section 3.2. The internal test space is used by Read/write test of self-diagnostics test, but user can’t use direct access. The system space is accessed inside the IDD at power-on or during the execution of a specific command, but the user cannot directly access the system space.

3.1.1Cylinder configuration

The IDD allocates cylinders to the user space, internal test space, and system space. Figure 3.1 is the cylinder configuration.

Spare areas (alternate areas) for defective sectors are provided in the user space. Several sectors in the last track of one cylinder and several cylinders (alternate cylinders) in the user space are allocated as alternate areas according to the user's assignment (MODE SELECT command). See Subsection 3.1.2 for details.

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Fujitsu MAG3182FC manual Data Format, Data Space Logical Data Block Addressing Defect Management, Cylinder configuration
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MAG3182FC, MAF3364FC, MAG3091FC specifications

Fujitsu has established itself as a leading provider of storage solutions, with a robust lineup that includes the MAG3182FC, MAG3091FC, and MAF3364FC hard drives. These models cater to the needs of enterprise and data center environments, focusing on reliability, performance, and advanced technology.

The Fujitsu MAG3182FC is a Fibre Channel hard drive designed for high-speed data transfer and optimal storage performance. With a capacity of 18.2 GB, it is built for applications requiring rapid access to data. The drive operates at a spindle speed of 10,000 RPM, ensuring quick data retrieval and low latency. It features a 2 Gbps Fibre Channel interface, which allows for fast communication between the drive and the server, making it ideal for environments that demand high throughput, such as transaction processing and database management.

Next in line is the Fujitsu MAG3091FC. This model takes the capabilities of its predecessor a step further with a capacity of 9.1 GB and similar 10,000 RPM speed. The MAG3091FC is also equipped with a 2 Gbps Fibre Channel interface, providing the same high-performance connectivity. Its reliability is enhanced with advanced error correction and a design that minimizes the risk of data loss, making it suitable for mission-critical applications where uptime is essential.

Lastly, the Fujitsu MAF3364FC hard drive is tailored for enterprise-level operations, featuring a capacity of 36.4 GB. It utilizes a 10,000 RPM spindle speed and is built with the same 2 Gbps Fibre Channel interface, ensuring swift access to stored data. The MAF3364FC stands out for its improved data integrity features, including sophisticated error correction codes and a robust design that enhances durability. Its higher capacity combined with fast access times makes it a versatile choice for data-intensive applications and large-scale storage solutions.

All three drives incorporate Fujitsu's commitment to innovation, featuring technologies like S.M.A.R.T (Self-Monitoring, Analysis, and Reporting Technology) for predictive failure analysis. They are designed to operate in demanding environments, ensuring that businesses can rely on them for consistent performance and data protection. In summary, the Fujitsu MAG3182FC, MAG3091FC, and MAF3364FC represent a powerful collection of enterprise-grade hard drives, providing advanced features and technologies that meet the rigorous demands of modern data storage needs.
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