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10.7.7.2 SMART commands
This register should be set to C2h for SMART commands
10.7.8 Device/Head Register
- CS0 DA2-DA0 : 6 Read / Write
The value of this register is used to select the drive, Master or Slave, and head. On multiple sector
read/write operation that requires to cross track boundaries, the head select bit will be updated to reflect the
currently selected head number.
1 L 1 DEV HS3 HS2 HS1 HS0
Bit 7 Reserved (recommended to set 1)
Bit 6
L
(Select LBA mode) L=0: CHS mode. L=1: LBA mode.
Bit 5 Reserved (recommended to set 1)
Bit 4
DEV
(Device Select):
- (Master/Slave mode) This bit is used to select the drive. DEV= 0 indicates the first fixed disk drive
(Master), and DEV= 1 indicates the second (Slave).
- (Single mode) should be 0. If this is 1, a drive is not selected but 00h shall be returned to status
register.
Bit 3 -
Bit 0
HS3-HS0 (Head Select Bits) -- Bits 3 through 0 determine the required read/write head. Bit 0 is the
least-significant bit. If the L bit is equal to one (LBA Mode), the HS3 through HS0 bits contain bits 27
through 24 of the LBA.