
Glossary
178 New Template
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.
interface A hardware or software protocol, contained in the
electronics of the tape controller and tape drive that managed
the exchange of data between the drive and computer. The
most common interfaces for small computer systems are AT
(IDE) and SCSI.
internal drive A drive mounted inside one of a computer’s drive bays.
Internet A worldwide network of computer servers originally
developed by the federal government as a communication
system in the event of nuclear war or other wide-scale disaster.
intranet A private version of the Internet that provides a cost-effective
way to publish critical information and provide an interactive
communication path for heterogeneous systems.
Comentarios a estos manuales