Fujitsu MBA3073RC, MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC specifications Read Extended, Fua

4.2 Data Access Commands

4.2.2 READ EXTENDED (28)

	Bit	7	6	5	4		3	2	1	0
Byte
0						X'28'
1		0	0	0	×		FUA	0	0	0
2				Logical Block Address (MSB)
3				Logical Block Address
4				Logical Block Address
5				Logical Block Address (LSB)
6		0	0	0	0	0		0	0	0
7				Transfer Block Count (MSB)
8				Transfer Block Count (LSB)
9		0	0	0	0	0		0	0	0

This command reads the number of blocks of data in continuous logical data blocks specified in the "Transfer block count" field with the logical data block on the disk media specified in the "Logical block address" field in the CDB as the top.

The functions of this command are the same as those of the Group 0 READ command (Section 4.2.1) with the exception that it is possible to specify 4-byte logical block addresses and 2-byte transfer block counts. However, when zero is specified for the "Transfer block count," the command is terminated normally without seek and pre-fetch being performed.

∙FUA (force unit access)

When this bit is "0", it indicates that the HDD satisfy the command by accessing the cache memory. Any logical blocks that are contained in the cache memory may be transferred to the INIT directly from the cache memory.

When this bit is "1", it indicated that the HDD shall access the media in performing the command prior to returning GOOD status. READ commands shall access the specified logical blocks from the media (i.e., the data is not directly retrieved from the cache).

C141-C013 215