Re: Problems trying to build 2.88 meg image.

[Jeff Noxon <jeff@planetfall.com>]

On Sat, Aug 29, 1998 at 06:17:35PM -0400, Dale Scheetz wrote:
> The info pages on mtools has a discussion of geometry, but only 1.44 and
> below. There is no mention of the 2.88 format.
> 
> My interest is for a CD boot image, as the ET format will accept a 2.88
> image. I only need to be able to build one.

If you look in the kernel source (drivers/block/floppy.c), you'll
find this:

static struct floppy_struct floppy_type[32] = {
        {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
        {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
        { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
        {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
        { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
        {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
        { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
        { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
        { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
        { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120"},  /*  9 3.12MB 3.5"   */

So it looks like 2.88 meg disks simply double the number of sectors/track.

Hope this helps,

Jeff