(1)Mode = 0, 0, 0, 0: Header + data, without address specification

When this mode is specified, the data stored in the IDD’s data buffer are transferred to the INIT after the 4-byte header. Zero must be specified in the “Buffer offset” field in the CDB.

The “Transfer byte count” field in the CDB specifies the total number of bytes of the header and buffer data which can be received by the INIT. The IDD reads the data from the data buffer from the top (Address X ‘000000’), then adds the 4-byte header to it and transfers it to the INIT. Data transfer is completed at the point when the number of bytes of the header and data from the IDD’s data buffer, specified in the “Transfer byte length” field, has been transferred, or at the point when transfer of the header and all the data in the IDD’s data buffer, to the final byte position, has been completed. When zero is specified in the “Transfer byte length” field, this command is terminated without executing a data transfer.

The format of the data transferred to the INIT when this mode is specified is shown in Figure 3.25.

Header

Data

Byte

Bit

7

6

5

4

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

0

0

0

0

0

0

0

 

 

 

 

 

 

1

 

 

 

Effective Buffer Data Length (MSB)

 

 

 

 

 

 

 

 

 

2

 

 

 

Effective Buffer Data Length

 

 

 

 

 

 

 

 

 

 

3

 

 

 

Effective Buffer Data Length

(LSB)

 

 

 

 

 

 

 

 

 

 

4

 

 

 

Buffer Data (Byte 0)

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

Buffer Data (Byte 1)

 

 

 

 

 

 

 

~

~

~

 

~

~

 

~

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

n

 

 

Buffer Data (Byte n–4)

 

 

 

 

 

 

 

 

Figure 3.25 READ BUFFER command: buffer data (Mode = 0000, 0001)

The “Effective buffer data length” field in the header indicates the size of the data buffer (byte length). This value indicates the size of the IDD’s data buffer that can be used by the WRITE BUFFER and READ BUFFER commands without relation to the length specified in the “Transfer byte length” field in the CDB or the length of the data actually stored in the data buffer by the WRITE BUFFER command. When this mode is specified, the “Effective buffer data length” shows the size (cache segment volume) of the IDD’s entire data buffer area. Also, the length of the buffer data transferred to the INIT by this command is the value for the number of bytes in the [“Transfer byte length” field in the CDB – 4 bytes] or the value indicated in the “Effective buffer data length” field in the header, whichever is smaller.

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Fujitsu MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES specifications Read Buffer command buffer data Mode = 0000
Page 189 Page 191

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.

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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.

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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.
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