5 Jul
2005
5 Jul
'05
8:39 p.m.
Hello all,
Believe it or not, I couldn't find this on google, so I humbly submit
it here....
Does anyone have a list of the built-in drive types from the original
IBM AT? I'd like the drive number, heads, cyls, and capacity if you
I have a BIOS source listing that gives the hard disk parameter tables.
It's not the _original_ BIOS (it's the 1985 one), but I think earlier
ones just defined fewer drive types. Anyway :
No Cylinders Heads Write Precomp Landing Zone Sectors/track
1 306 4 128 306 17
2 615 4 300 615 17
3 615 6 300 615 17
4 940 8 512 940 17
5 940 6 512 940 17
6 615 4 none 615 17
7 462 8 256 511 17
8 733 5 none 733 17
9 900 15 none 901 17
10 820 3 none 820 17
11 855 5 none 855 17
12 855 7 none 855 17
13 306 8 128 319 17
14 733 7 none 733 17
15 ------- RESERVED -- Do not use ----------------------------
16 612 4 all 663 17
17 977 5 300 977 17
18 977 7 none 977 17
19 1024 7 512 1023 17
20 733 5 300 732 17
21 733 7 300 732 17
22 733 5 300 733 17
23 306 4 all 336 17
Guessing what the various drives were is left as an exercise for the
reader :-)
-tony