NEC CP/M-86 - Physical and Logical Structures for Floppy Diskettes; Physical and Logical Addressing for Floppy Diskettes

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.