2-14
Theory of
Operation
At
the command set level, a clear D bit indicates a data
AM
in
the data field and a set D bit
indicates a deleted data
AM
in
the data field.
Presently, all data fields contain a data
AM.
If
error
correcting code (ECC) bytes are added
to the data field
in
the future, an ECC data
AM
will
be used, allowing interchange between
ECC
and non-ECC systems.
Track Format. Detailed track formats
for
the
HP
Format and
IBM
Format are shown
in
Figures
2-4
and
2-5,
respectively.
Index
Hole
.n.
\.1
-L1_s_e_ct_or_o_.L-G.:;.~...,P
,...I
__
se_c_to_r
1_41"..JJ_\
I Sector
28
(34)
",
__
"
........
Gap
2
(34)
...
--
",' '
.............
,.,,,,,
--
,
I
("
10 Field
I Gap 1 I
Data Field
• <
....
,(16)
GO_
....
Sector 29
--
--
--
c .........
Index
Hole
.n..
Gap
3·
I Sector 0 I
~
(490)
...
...
: " "
l "
............................
,
... ...
·~I~I_OO~~F_F~~A~ID~M~.
~1~T~~~~k~I_S~~~~to_rl~c~Rc~I_
....
...,:~;_·~1
;'rf~·I-OO-~-FF~lrO~Aa-~~--D-a-ta-~-:-:-c'-r'-:-~~>~I~
.........
(4) (4) (1)
(1)
(1) (2) (1) (4) (4) (1) (2) (1)
(X) = Number
of
Bytes
Gap
Length
(Bytes)
1
16
2
34
3
490·
Hex
Value
00
00
00
• Gap 3 Length IS Approximate
Since
it
Depends
On
Exact
Recording
Speed.
Figure 2-4. Hewlett-Packard Standard
Sector
Recording Format
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