Hard Disk CMOS Standard Types Geometry

The following table may help when you know the size of a HD of an obsolete PC, but its CMOS doesn't support user-defined types

Some types aren't listed in the next table. They are the supposed user-defined types.

Usually - in newest mainboards -, when you need a user-defined type, you use types 47 and -if I recall correctly- 48. It depends of the BIOS frontend to the CMOS settings

Type	Heads	Secs/Cyl	Cylinders	Pre-comp	L-zone	Capacity (Mb)
1	4	17	306	128	305	10
2	4	17	615	300	615	21
3	6	17	615	300	615	32
4	8	17	940	512	940	65
5	6	17	940	512	940	65
6	4	17	615	no	615	21
7	8	17	462	256	511	32
8	5	17	733	no	733	31
9	15	17	900	no	901	117
10	3	17	820	no	820	21
11	5	17	855	no	855	37
12	7	17	855	no	855	52
13	8	17	306	128	319	21
14	7	17	733	no	733	44
16	4	17	612	all	663	21
17	5	17	977	300	977	42
18	7	17	977	no	977	59
19	7	17	1024	512	1023	62
20	5	17	733	300	732	31
21	7	17	733	300	732	44
22	5	17	733	300	733	31
23	4	17	306	all	336	10
24	5	17	977	no	976	42
26	7	17	1024	no	1023	62
27	11	17	1024	no	1023	98
28	15	17	1024	no	1023	133
29	8	17	1024	no	1023	71
30	11	17	1024	no	1023	98
32	9	17	925	no	926	72
33	10	17	1024	no	1023	89
34	12	17	1024	no	1023	106
35	13	17	1024	no	1023	115
36	14	17	1024	no	1023	124
37	2	17	1024	no	1023	17
38	16	17	1024	no	1023	142
40	6	17	820	no	820	42
41	5	17	1024	1024	1023	44
42	8	17	615	512	615	42
43	7	17	1186	no	1186	72

Started 03/08/2001 / Updated 2002-02-05 23:01:57.000000000 +0100

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