Whats a logical drive and what does it do? What other types of drives are there?

Your hard drive is called a physical drive. If you have only one partition, it's your C: drive. You can "cut" your physical drive up into logical drives. For example, if you buy an 80GB drive, you might "cut" it up into a 10GB C: drive for your operating system, a 10GB drive for applications, another 10GB drive for data files, and a 50GB drive for music and photos. You would then have C:, D:, E:, and F: drives. I round the numbers off since your drive is never exactly what it says on the box -- an 80GB drive may be, for example, 81.4GB.

A drive is made usable by partitioning and formatting the drive. There are two types of partitions. Primary and extended. Only primary partitions can boot. The extended partition was a method to get around primary partition limits. To utilize space in the extended partition you had to assign logical drive letters. You can think of the extended partition as a pie. You can assign one logical drive letter to the entire pie or divide the pie up into multiple pieces and multiple logical drive letters. But in these days of having 4 primary's max per disk there really isn't a need anymore for extended partitions and logical drive letters. Play with Fdisk on a blank drive for a hands on learning experience concerning extended partition and assigning logical drive letters which is shortened to logical drives.