(4) Read ID
PHASE
Command
Execution
R/W
D7 D6 D5 D4 D3 D2 D1 D0
W
0 MFM 0 0 1 0 1 0
W
0 0 0 0 0 HDS DS1 DS0
Result
(5) Verify
PHASE
Command
R
-------------------- ST0 -----------------------
R
-------------------- ST1 -----------------------
R
-------------------- ST2 -----------------------
R
---------------------- C ------------------------
R
---------------------- H ------------------------
R
---------------------- R ------------------------
R
---------------------- N ------------------------
R/W
D7 D6 D5 D4 D3 D2 D1 D0
W MT MFM SK 1 0 1 1 0
W EC 0 0 0 0 HDS DS1 DS0
W
---------------------- C ------------------------
W
---------------------- H ------------------------
W
W
W
W
Execution
Result
R
R
R
R
R
R
R
---------------------- R ------------------------
---------------------- N ------------------------
-------------------- EOT -----------------------
-------------------- GPL -----------------------
-------------------- DTL/SC -------------------
-------------------- ST0 -----------------------
-------------------- ST1 -----------------------
-------------------- ST2 -----------------------
---------------------- C ------------------------
---------------------- H ------------------------
---------------------- R ------------------------
---------------------- N ------------------------
REMARKS
Command codes
The first correct
ID information on
the cylinder is
stored in Data
Register
Status information
after command
execution
Disk status after
the command has
been completed
REMARKS
Command codes
Sector ID
information prior
to command
execution
No data transfer
takes place
Status
information after
command
execution
Sector ID
information after
command
execution
28