CD ROM is a Compact Disk, Read Only Memory. the CD ROM contains data accessible to, but not writable by, a computer for data storage and music playback. |  |
 | A Memory Stick is a portable storage device, which can be connected to a computer via USB port. The storage can be valued as 249mb, 4gb, 8gb and 16gb. |
HardDiskDrive (HDD) is the storage device of the computer. You can access the Hard Drive by "My computer". |  |
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