Having problems fdisking WD Caviar 23200, 3.2 gig HDD, fdisk info shows 2 partitions,

C: 1 A PRI DOS 2004 FAT 16 65%
2 EXT DOS 1091 35%

It then says EXT DOS partition contains logical dos drives, if I say yes to information it says "no logical dos drives defined,

The problem I have is I can't delete anything, it wont let me delete PRI DOS when EXT DOS partition exists,
I can't delete EXT partition while LOGICAL drive exists, if I try and delete LOGICAL PARTITION in the EXT DOS drive, it says NO LOGICAL DOS DRIVES DEFINED,