A floppy disk drive use 3.5"disks, which can store 1.44MN of data; it is usually assigned to the A: drive. Floppy drives are becoming increasingly rare.
The inside of a hard drive
Most PCs have one internal hard drive, usually called C: drive. It is used to store the operating system, the programs and the user's files in a convenient way. A hard drive can hold hundreds of gigabytes of data.
A portable external hard drive
External hard drives are connected to the USB or FireWire port of the computer. They can be as small as wallet but can have as much capacity as internal drives; they are typically used for backup or as secondary storage.
Magnetic tapes and drive
A tape drive reads and write data on tapes. It is sequencial-acces-i.e. to get to a particular point on the top tape, it must go through all the preceding points. Tapes can hold hundreds od gigabytes of data and are used for data collection, backup and archiving.
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