2 smart commands, 8 device/head register – Toshiba MK6017MAP User Manual

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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.

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.