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Fujitsu MAP3735, MAP3367, MAP3147, MAS3735, MAS3367 Data Block Addressing Definition of data space

Models: MAP3735 MAP3147 MAS3367 MAP3367 MAS3735

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Command Processing

After this state occurs, the IDD reports the CHECK CONDITION status for all input/output operation requests except the REQUEST SENSE command. The sense data reported at this time indicate HARDWARE ERROR [=4] / Internal target failure [=44-nn]. If this state is reported continuously for input/output operation requests, it is necessary for the INIT to generate a RESET condition or send a TARGET RESET message and attempt to recover from the error state. For recommended procedures for error recovery methods by the INIT, see the explanation in Section 5.2 “INIT’s Error Recovery Methods (Recommended).”

1.8Data Block Addressing

1.8.1Definition of data space

The IDD manages the data storage area on the disk drive in the following 2 types of data space.

•User space: user data storage area

•System space: IDD exclusive area

Within these 2 areas, the user can clearly access the user space. The data format and defect management methods in this space are the same and it is possible to access this space by logical data block addressing described in Section 1.8.2. System space is accessed by the IDD internally when the power is switched on or during processing of specific commands, but it cannot be accessed directly by the user.

Figure 1.5 shows the data space configuration on the disk drive. The number of cylinders allocated to user space can be referred by the user (MODE SENSE or MODE SENSE EXTENDED command).

A spare sector area (alternate area) for use as alternate sectors for defective sectors is allocated in the user space. The IDD manages defects for each cell, which consists of several cylinders (see Figure 1.5). The user can allocate the number of sectors in the last track of each cell as the alternate area (by the MODE SELECT or MODE SELECT EXTENDED command). Alternate cylinders for the IDD cannot be altered by the user.

Alternate data blocks are allocated in defect sector units for defective sectors on the disk media through internal IDD defect management. Through this defect management, the INIT can access all the logical data blocks in the user space as if they were error free.

For details concerning the data format on the disk media (cylinder configuration, track format and sector format) and details concerning defect management techniques and alternate block allocation techniques, Chapter 3 “Data Format” in the “Product Manual.” For an outline of defect management techniques, see “Disk Media Management” in Chapter 6 of this manual.

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Fujitsu MAP3735, MAP3367, MAP3147, MAS3735, MAS3367 specifications Data Block Addressing Definition of data space
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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.