Maxtor 10K V 5.21READ CAPACITY Command (25h)

5.21READ CAPACITY Command (25h)

The READ CAPACITY command reports formatted capacity and track-boundary information. The data format and field descriptions are shown in Table 5-125and Table 5-126respectively.

Table 5-125READ CAPACITY Command-Data Format

Bit	7	6	5	4		3	2	1	0
Byte
0				Operation	Code (25h)
1				Reserved					RelAdr
2 - 5				Logical Block Address
6 - 7				Reserved
8				Reserved					PMI
9				Control

Table 5-126READ CAPACITY Command-Field Descriptions

Field	Description
RelAdr	Relative Addressing is not supported by the drive; the field must be 0.
Logical Block Address	Used in conjunction with the PMI bit. Must be 0 when the PMI bit is 0.
	Partial Media Indicator. When the value in the field is 0, the Returned Log-
	ical Block Address (Table 5-127)is that of the last logical sector of the log-
	ical unit.
	When the value is 1, the Returned Logical Block Address is that of the last
PMI	sector on the same cylinder as the Logical Block Address supplied in the
	Command Descriptor Block's LBA field. That is, the Returned Logical
	Block Address is that of the Logical Block Address before a substantial de-
	lay in data transfer will be encountered).
	In either case, Block Length in Bytes (Table 5-127)is the unit's logical sec-
	tor size, as determined by the Block Length field in the Mode parameter
	Block Descriptor.

Table 5-127shows the READ CAPACITY Returned Data - Data Format that will be sent during the data-in buffer transfer for the command. Refer to the PMI description in Table 5-126for a description of these data fields.

Table 5-127READ CAPACITY Returned Data-Data Format

Bit	7	6	5		4	3	2	1	0
Byte
0 - 3				Returned Logical Block Address
4 - 7					Block Length in Bytes

5-96 Maxtor Atlas 10K V