/* /=========================================\
 * |PARTITION TABLE LAYOUT (offset 446|0x1BE)|
 * \=========================================/
 *
 *  +--- Bit 7 is the active partition flag, bits 6-0 are
 *  |    zero (when not zero this byte is also the drive
 *  |    number of the drive to boot so the active
 *  |    partition is always found on drive 80H,
 *  |    the first hard disk).
 *  |
 *  |    +--- Starting CHS in int $0x13 call format.
 *  |    |
 *  |    |      +--- Partition type byte.
 *  |    |      |
 *  |    |      |    +--- Ending CHS in int $0x13 call format.
 *  |    |      |    |
 *  |    |      |    |       +-- Starting LBA.
 *  |    |      |    |       |
 *  |    |      |    |       |        +-- Size in sectors.
 * /|    V     /|    V       V        V
 * VV /--+---\ VV /--+---\ /-+---\  /-+----\
 * 0  1  2  3  4  5  6  7  8 9 A B  C D E F  <- offset
 * DL DH CL CH TB DH CL CH LBA..... SIZE.... ===========
 * 00 00 01 04 83 FE 7F 08 04FB0000 C5FA3F00  1st entry
 * 00 00 41 09 82 FE BF 0D C9F54000 C5FA3F00  2nd entry
 * 80 00 81 0E 0C FE FF FF 8EF08000 63EFA606  3rd entry
 * 00 01 01 00 83 FE 3F 03 3F000000 C5FA0000  4th entry
 *
 * The above translates to this (from linux fdisk):
 * Nr AF  Hd Sec  Cyl  Hd Sec  Cyl   Start      Size ID
 *  1 00   0   1    4 254  63  264   64260   4192965 83
 *  2 00   0   1  265 254  63  525 4257225   4192965 82
 *  3 80   0   1  526 254  63 1023 8450190 111603555 0c
 *  4 00   1   1    0 254  63    3      63     64197 83
 *
 * If the primary partition table type byte is f, the
 * following is found at the start...
 * /==================================================\
 * |EXTENDED PARTITION TABLE LAYOUT (offset 446|0x1BE)|
 * \==================================================/
 * reference:
 * http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us/prkd_tro_kyrr.asp
 *
 * The extended partition table is identical to the above
 * except that entry 1 points to the start of the current
 * extended partiton, and entry 2 is a linked list to the
 * next extended partiton table.  Entries 3 and 4 are not
 * used.
 *
 */