Maxtor Computer Drive Product Manual page 61

EMBEDDED SERVO – A timing or
location signal placed on the disk's surface on
the tracks that also store data. These signals
allow the actuator to fine-tune the position of
the read/write heads.
ENCODING – The protocol by which
particular data patterns are changed prior to
being written on the disk surface as a pattern
of On and Off or 1 and 0 signals.
EOF - End Of Frame
EXTERNAL DRIVE – A drive mounted in
an enclosure separate from the PC or
computer system enclosure, with its own
power supply and fan, and connected to the
system by a cable.
F
FAT – Acronym for file allocation table. A data
table stored on the outer edge of a disk that
tells the operating system which sectors are
allocated to each file and in what order.
FCI – Acronym for flux changes per inch. See
also BPI.
FILE SERVER – A computer that provides
network stations with controlled access to
shareable resources. The network operating
system is loaded on the file server, and most
shareable devices (disk subsystems, printers)
are attached to it. The file server controls
system security and monitors
station-to-station communications. A
dedicated file server can be used only as a file
server while it is on the network. A non
dedicated file server can be used
simultaneously as a file server and a
workstation.
FIS - See Frame Information Structure
FLUX DENSITY – The number of
magnetic field patterns that can be stored in a
given length of disk surface. The number is
usually stated as flux changes per inch (FCI),
with typical values in the thousands.
FLYING HEIGHT – The distance between
the read/write head and the disk surface
caused by a cushion of air that keeps the head
from contacting the media. Smaller flying
heights permit more dense storage of data, but
require more precise mechanical designs.
FORMAT – To write onto the disk surface a
magnetic track pattern that specifies the
locations of the tracks and sectors. This
information must exist on a disk before it can
store any user data. Formatting erases any
previously stored data.
FORMATTED CAPACITY – The
amount of room left to store data on the disk
after the required space has been used to write
sector headers, boundary definitions, and
timing information generated by a format
operation. All Maxtor drive capacities are
expressed in formatted capacity.
FORM FACTOR – The physical outer
dimensions of a device as defined by industry
standard. For example, most Maxtor disk
drives use a 3 1/2-inch form factor.
FRAME - A frame is an indivisible unit of
information exchanged between a host and
device. A frame consists of a SOF (Start Of
Frame) primitive, a Frame Information
Structure, a CRC calculated over the
contents of the FIS, and an EOF (End Of
Frame) primitive.
FRAME INFORMATION
STRUCTURE - The user payload of a
frame, does not include the SOF (Start Of
Frame), CRC, and EOF (End Of Frame)
delimiters.
G
GIGABYTE (GB) – One billion bytes (one
thousand megabytes).
GUIDE RAILS – Plastic strips attached to
the sides of a disk drive mounted in an IBM
AT and compatible computers so that the
drive easily slides into place.
H
HALF HEIGHT – Term used to describe a
drive that occupies half the vertical space of
the original full size 5 1/4-inch drive. 1.625
inches high.
Maxtor DiamondMax 8S 40GB SATA
GLOSSARY
G-3