+Describe command returns 37 bytes:
+
+ bytes 6-8: String (6 4-bit BCD digits)
+ bytes 9-10: Bytes per sector
+ bytes 24-26: Maximum cylinder number
+ byte 27: Maximum head number
+ bytes 28-29: Maximum sector number (in a track)
+ bytes 32-35: Maximum sector number (on disk)
+
+Note we can't use a structure due to alignment problems.
+
+NAME CS80/ID STRING CYLS HDS SECT BPS MBS
+
+7914 20B 079140 575 7 64 256
+7933A 212 079330 660 13 92 256
+7945 220 079450 483 7 32 256
+7957 22A 079570 506 5 63 256
+7958 22B 079580 506 8 63 256
+9134L 222 091340 0 1 1 256
+