Glossary
SuperLoader User’s Guide 265
full height
Dimensions of a drive that meet standard height
requirements, usually 3.25 inches (82.55 mm) for a tape or disk drive
product.
G
GB Gigabyte. A unit of measure consisting of one billion bytes (one
thousand megabytes).
GHz Gigahertz. A measurement of frequency that equals one thousand
million Hz, or one thousand MHz. Speeds for computer microprocessors,
buses, and interfaces are often measured in GHz.
H
half height Standard drive size equivalent to half the vertical space of a
5.25 inch (133.35 mm) drive.
hard drive A drive that reads and writes data on a hard disk. The terms
hard drive and hard disk are often used interchangeably.
hard error A data error that persists when the tape is reread, usually
caused by defects in the physical surface.
head The tiny electromagnetic coil and metal pole used to create and
read back the magnetic patters on the tape. Also known as the read/write
head.
head life The length of time a tape drive head will function without
replacement or repair, usually measured in hours of use.
Hierarchical Storage Management (HSM) A method of storing massive
amounts of data in tape libraries that allows for easy and rapid recall of
the material. Due to the lowering cost of disk drives, HSM has yet to
reach its full potential.
HTTP Hypertext Transfer Protocol. A protocol for exchanging files
between computers connected to the Internet.
Hz Hertz. A unit of frequency measurement that equals 1 cycle per
second. Computers and electronic devices are often measured in
kilohertz (kHz), megahertz (MHz), gigahertz (GHz), or terahertz (THz).
I
ISV Independent Software Vendor.
image backup A backup option that takes a “snapshot” of an entire
system by writing a volume image to tape sector-by-sector, rather than
file-by-file. This method of backup is very fast and allows companies to
backup critical information in a limited backup window.
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