USB booting :: USB disk used to boot, yet now it doesn't

ok, I managed to sneakily make a dsl cd while at work. Here is what happens when i do a "sfdisk -l /dev/sda":

Disk /dev/sda: 31 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

  Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sda1          0+     30      31-    248976    6  FAT16
/dev/sda2          0       -       0          0    0  Empty
/dev/sda3          0       -       0          0    0  Empty
/dev/sda4          0       -       0          0    0  Empty

EDIT: Does this look ok? Is there any adjustments I can do?

Nope, looks wrong.

According to the docs...
http://www.damnsmalllinux.org/talk/node/86
it should be 32 sectors per track.  (also I wiped all the partitions on mine - why they come standard with 4 partitions, three of which have no space is beyond me )

Ok, I'll have a go at changint the geometry, it should sort things.... Thanks for the link.