USB
A USB drive -- also known as a flash drive or keychain drive -- is a plug-and-play portable storage device that uses flash memory and is lightweight enough to attach to a key chain. A USB drive can be used in place of a floppy disk, Zip drive disk, or CD. When the user plugs the device into the USB port, the computer's operating system recognizes the device as a removable drive and assigns it a drive letter.
CDRom
Short for Compact Disc-Read Only Memory, CD-ROM drives or optical drives are CD players inside computers that can have speeds in the range from 1x and beyond, and have the capability of playing audio CDs and computer data CDs. Below is a picture of the front and back of a standard CD-ROM drive.
External Hard Drive
External hard drives are used to back up or store important information separately from the main internal hard drive in order to avoid compromise by online or offline activities. They are also used to save sensitive documents, large music files, DVD images, movies, disk images, and even backup contents of the main internal hard drive.
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