how many partitions can i have on a drive
PC Architecture limit is 4 partitions per physical drive. Drive letters though are a different story. There are three types of partitions: primary partitions, extended partitions and logical drives. A disk may contain up to four primary partitions (only one of which can be active), or three primary partitions and one extended partition. In the extended partition, the user can create logical drives (i.e. simulate several smaller-sized hard drives).