Microsoft Office Tutorials and References
In Depth Information
COM 16
A DVD-ROM (digital versatile disk-read-only memory) is a very high-capacity optical disc
capable of storing from 4.7 GB to 17 GB — more than enough to hold a telephone book
containing every resident in the United States. As with the CD-ROM format, you cannot write on an
optical disc that uses the DVD-ROM format. You can only read from it. To read a DVD-ROM,
you need a DVD-ROM drive . Most DVD-ROM drives can also read CDs.
DVD-R and DVD+R are competing DVD-recordable formats, each with up to 4.7 GB storage
capacity. Both allow users to write on the disc once and read (play) it many times. Two newer, more
expensive DVD-recordable formats are Blu-ray (BD-ROM) and HD DVD , with higher quality and
more capacity than standard DVDs. DVD-RW , DVD+RW , and DVD+RAM are competing DVD
formats, each with storage capacities up to 4.7 GB per side, that allow users to erase and write (record)
many times. BD-RE and HD DVD-RW are competing higher-capacity rewriteable DVD formats. To
write to a DVD, you need a recordable or rewriteable DVD-ROM drive.
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Tape is a magnetically coated ribbon of plastic housed in a tape cartridge (Figure 22) capable of
storing large amounts of data and information at a low cost. A tape drive is used to read from
and write on a tape. Tape is primarily used for long-term storage and backup.
Mobile Storage Media
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Miniature Mobile
Storage Media.
Miniature Mobile Storage Media
Miniature mobile storage media are
rewriteable media usually in the form of
a flash memory card, USB flash drive, or
a smart card. Miniature mobile storage
media allow mobile users to transport
digital images, music, or documents
easily to and from computers and other
devices (Figure 23).
A tape drive and a tape cartridge.
FIGURE 23 Many
types of computers
and devices use
miniature mobile
storage media.
miniature mobile
storage media
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