Provides long filename support. On a normal drive there is the option to have only two partitions, a Primary partition and an extended partition. The latter has the capability to have up to 23 logical drives created within it, bringing the total to 24 drive letters per drive. Among other things, boot sector viruses. They take over before any other programs can run, such as anti-virus programs, hence the need to boot from a clean system.
Disks consist of many platters.
RW heads for each side of each platter. Actuator moves over the spinning disks at speeds of 50 times per second provides random access to the entire disk. Tracks, Cylinders and Sectors are created by low level formatting. Cylinders - Set of all the tracks on all the sides of all the platters which are a particular distance from the center of the stack of platters. Logical Formatting creates a FAT and defines the minimum number of sectors in the clusters used in that drive.