Mylex Global Array Manager Installation Manual And User's Manual page 189

Glossary
(approximately 39 feet) with up to 15 drives. LVD also lowers noise, power
usage, and amplitude.
LVD differs from conventional differential signaling in that only positive
and negative values are distinguished, not voltage levels. Other advantages
are that LVD devices consume less power and can sense single-ended
devices on the bus and revert to single-ended signaling. Devices need to be
Ultra2 SCSI LVD drives in order to take advantage of the LVD signaling.
Mylex AcceleRAID, eXtremeRAID, and DAC FL controllers are LVD
controllers.
Megabit
A million bits; used as a common unit of measure, relative to time in
seconds, as an expression of a transmission technology's bandwidth or data
transfer rates (abbreviated as Mb). Megabits per second (Mbps) is a frequent
measure of bandwidth on a transmission medium.
Megabyte
20
2 (1,048,576) bytes. One megabyte can store more than one million
characters. Abbreviated as M or MB.
Mirrored Cache
A cache memory that has duplicate data from another controller. In the event
of failure of the original controller, the second controller can take the cached
data and place it on the disk array.
Mirroring
The complete duplication of data on one disk drive to another disk drive, this
duplication occurs simultaneously with each write operation: each disk will
be the mirror image of the other (also known as RAID Level 1, see RAID
Manual No. SA67-0049-01 Glossary-13