You need an extended partition to contain the logical partitions. By some interpretations of the meanings of the terms, an extended partition is a kind of primary partition.
Certainly by the way the data structures are are stored on the disk, an extended partition is a kind of primary partition.
But many partitioning programs do not represent your choices as if extended were a kind of primary.
Anyway, you don't need any primary partition other than the extended partition that holds your logical partitions.
Last edited by johnsfine; 04-26-2010 at 11:21 AM.