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BIOS Disk Definition Tables
7-8
PHYSICAL AND LOGICAL STRUCTURES FOR FLOPPY DISKETTES
Table 7-7 Physical and Logical Addressing
for Floppy Diskettes
LOGICAL ADDRESS
PHYSICAL ADDRESS
SECTOR #
CYLINDER #
HEAD#
SECTOR #
TRACK #
FDI (SKEW 6)
FD2 (SKEW 3)
n
0
I
0
I
( 1,2)
n
0
2
0
14
(19,20)
n
0
3
0
10
(37,38)
4
23
( 3, 4)
5
6
(21,22)
6
19
(39,40)
7
2
( 5,6)
8
15
(23,24)
9
II
(41,42)
10
24
( 7, 8)
II
7
(25,26)
12
20
(43,44)
13
3
( 9,10)
14
16
(27,28)
15
12
(45,46)
16
25
(II ,12)
17
8
(29,30)
18
21
(47,48)
19
4
(13,14)
20
17
(31,32)
21
13
(49,50)
22
26
(15,16)
23
9
(33,34)
24
22
(51,52)
25
5
( 17,18)
0
26
0
18
(35,36)
1
1
I
( 1,2)
1
2
1
(19,20)
1
3
I
(37,38)
4
( 3, 4)
5
(21,22)
6
(39,40)
7
none
( 5,6)
8
9
10
II
12
13
14
15
n
1
26
1
18
(35,36 )
For hard disk, no translation is necessary.
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