User's Guide

Glossary
Quantum A-Series Tape Drives User’s Guide 87
PRML
Partial Response Maximum Likelihood is a method for
converting the weak analog signal from the head of a magnetic
disk drive into a digital signal. Also see <Link>Advanced PRML.
PWA Printed Wiring Assembly - Commonly known as PCB(A) for
Printed Circuit Board (Assembly).
Q
QEZ
An Application Specific Integrated Circuit (ASIC) for the tape
drive.
R
Restore
To replace data on the hard drive with data obtained from
another media device.
RoHS Restrictions on Hazardous Substances is an EU directive that
restricts, and in some cases bans, the use of certain compounds in
the manufacture of electronic equipment. RoHS mandates that
new electrical and electronic equipment put on the market does
not contain lead, mercury, cadmium, hexavalent chromium,
poly-brominated biphenyls (PBB), or poly-brominated diphenyl
ethers (PBDE).
S
SAN
Storage Area Network.
SDLT Super Digital Linear Tape.
Seek The movement of a read/write head to a specific data track.
Server This is a FTP server embedded in the SDLT 600A firmware.
Shelf Life The length of time that media can be stored without losing its
magnetic strength. For Super DLTtape II media, this period is 30
years or more.
SI The International System of Units.
SITE This command is used for site-specific commands. Compliant to
FTP norm.
SRAM Static RAM. A memory chip that requires power to hold its
content.
T
Take-up Reel
The reel inside every tape drive onto which DLTtape or
Super DLTtape media is wound. The in-the-tape drive take-up
reel enables DLTtape and Super DLTtape systems to operate
using a single-reel cartridge and thereby pack more media and
data into every cartridge.