todd@ivucsb.sba.ca.us (Todd Day) (07/20/89)
I would like to modify the latest release of Mtools so it will work with 3.5" MS-DOS disks. The relevant changes have to be made to init.c, but I do not know what the FAT types are for 3.5 disks. When I tried to read a 3.5 disk, I get: Unknown format 'f9' mdir: Cannot initialize diskette Now, I've looked in init.c and it seems like it would be easy to change if I knew what all the relevant parameters were for MS-DOS 3.5" disks. case 0xfd: /* 40 trk, 9 sect, 2 sides */ dir_start = 5; dir_len = 7; clus_size = 2; fat_len = 2; num_clus = 354; gdbuf.params.heads = 2; gdbuf.params.psectrk = 9; gdbuf.params.pseccyl = 18; break; I suspect that for 80 tracks, all I would have to do is change num_clus, but I really have no idea. Anyone? -- "Like a pillar of cloud, the smoke lingers | Todd Day High in the air | todd@ivucsb.sba.ca.us In fascination - with the eyes of the world | ivucsb!todd@anise.acc.com We stare ..." -- Neil Peart of Rush, from "Countdown" on _Signals_
egray@fthood.UUCP (07/21/89)
>Reference the question on 720k 3.5in floppies with mtools...
The parameters for the init.c file are:
dir_start = 7;
dir_len = 7;
clus_size = 2;
fat_len = 3;
num_clus = 713;
if on a AT&T 7300, also add:
gdbuf.params.heads = 2;
gdbuf.params.cyls = 80;
gdbuf.params.psectrk = 9;
gdbuf.params.pseccyl = 18;
Emmet P. Gray US Army, HQ III Corps & Fort Hood
...!uunet!uiucuxc!fthood!egray Attn: AFZF-DE-ENV
fthood!egray@uxc.cso.uiuc.edu Directorate of Engineering & Housing
Environmental Management Office
Fort Hood, TX 76544-5057psfales@cbnewsc.ATT.COM (Peter Fales) (07/22/89)
In article <1989Jul20.025132.14819@ivucsb.sba.ca.us>, todd@ivucsb.sba.ca.us (Todd Day) writes: > I would like to modify the latest release of Mtools so it > will work with 3.5" MS-DOS disks. The relevant changes > have to be made to init.c, but I do not know what the > FAT types are for 3.5 disks. Craig Votava (hi Craig!) figured out how to get mtools1.5 working with the 720K disks. Putting his changes into mtools 1.6 is simply a matter of adding the following patch: (This assumes that the only 80 track drives on your system are 9 sector, i.e. no 1.2MB or 1.44MB disks, a reasonable assumption on the Unix-pc). Patch follows: *** /u/osrc/mtools16/init.c Wed Jul 19 22:17:35 1989 --- init.c Wed Jul 19 22:34:38 1989 *************** *** 95,100 gdbuf.params.psectrk = 9; gdbuf.params.pseccyl = 18; break; default: fprintf(stderr, "Unknown format '%02x'\n", fat); code = 1; --- 95,112 ----- gdbuf.params.psectrk = 9; gdbuf.params.pseccyl = 18; break; + + case 0xf9: /* all 80 track disks */ + dir_start = 7; + dir_len = 7; + clus_size = 2; + fat_len = 3; + num_clus = 713; + gdbuf.params.heads = 2; + gdbuf.params.cyls = 80; + gdbuf.params.psectrk = 9; + gdbuf.params.pseccyl = 18; + break; default: fprintf(stderr, "Unknown format '%02x'\n", fat); code = 1; -- Peter Fales AT&T, Room 5B-420 2000 N. Naperville Rd. UUCP: ...att!peter.fales Naperville, IL 60566 Domain: peter.fales@att.com work: (312) 979-8031