User Manual

SCSI Commands Reference Manual, Rev. J 158
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.23.2 READ CAPACITY (16) parameter data
The READ CAPACITY (16) parameter data is defined in table 122. Any time the READ CAPACITY (16) parameter data changes, the device server
should establish a unit attention condition as described in SPC-5.
RETURNED LOGICAL BLOCK ADDRESS field
The RETURNED LOGICAL BLOCK ADDRESS field and LOGICAL BLOCK LENGTH IN BYTES field of the READ CAPACITY (16) parameter data are the
same as the in the READ CAPACITY (10) parameter data (see 3.22.1). The maximum value that shall be returned in the RETURNED LOGICAL
BLOCK ADDRESS field is FFFFFFFF_FFFFFFFEh.
LOGICAL BLOCK LENGTH IN BYTES field
The LOGICAL BLOCK LENGTH IN BYTES field contains the number of bytes of user data in the logical block indicated by the RETURNED LOGICAL
BLOCK ADDRESS field. This value does not include protection information or additional information (e.g., ECC bytes) recorded on the medium.
RC BASIS field
The RC BASIS field indicates the meaning of the value returned by the RETURNED LOGICAL BLOCK ADDRESS field in the READ CAPACITY (16)
parameter data and is described in
table 123.
Table 122 READ CAPACITY (16) parameter data
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB)
RETURNED LOGICAL BLOCK ADDRESS. . .
7 (LSB)
8 (MSB)
LOGICAL BLOCK LENGTH IN BYTES. . .
11 (LSB)
12 Reserved RC BASIS P_TYPE PROT_EN
13 P_I_EXPONENT LOGICAL BLOCKS PER PHYSICAL BLOCK EXPONENT
14 LBPME LBPRZ (MSB)
LOWEST ALIGNED LOGICAL BLOCK ADDRESS
15 (LSB)
16
Reserved. . .
31
Table 123 RC BASIS field
Code
DESCRIPTION
00b
The RETURNED LOGICAL BLOCK ADDRESS field indicates the highest LBA of a contiguous
range of zones that are not sequential write required zones starting with the first zone.
01b
The RETURNED LOGICAL BLOCK ADDRESS field indicates the LBA of the last logical block
on the logical unit.
10b
Reserved
11
Reserved