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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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