FUJITSU MHV2120AT - Manual (Page 93)

5.3 Host Commands
C141-E218 5-17
Note: READ LONG (0x22) command/WRITE LONG (0x33) command became
a unsupport from the MHV2xxxAT series.
Notes:
FR: Features Register
CY: Cylinder Registers
SC: Sector Count Register
DH: Drive/Head Register
SN: Sector Number Register
R: Retry at error
1 = Without retry
0 = With retry
Y: Necessary to set parameters
Y*: Necessary to set parameters under the LBA mode.
N: Not necessary to set parameters (The parameter is ignored if it is set.)
N*: May set parameters
D: The device parameter is valid, and the head parameter is ignored.
*O: Option (customizing)
D*: The command is addressed to the master device, but both the master device
and the slave device execute it.
X: Do not care