|Optical disks provide robust online and archival
storage, boasting a 30-year life and allowing a million re-writes.
WORM disks can only be written to once.
Optical disks are typically used
in high-end disk libraries. MO access times are in the sub-25ms range, compared
to more than 100ms for phase change disks.
Data is written on an optical disks by both a laser and a magnet. The laser
heats the bit on the disk's surface to the temperature at which molecules can be
magnetically realigned; then a magnet on the opposite side of the disk changes
the bit's polarity to one of two possible positions. While normally done in two
passes, a more expensive one-pass method has also been developed.
Reading is accomplished with a lower-power laser that reflects light from the
bits. Depending on how the bit on the disk's surface was aligned, the light will
reflect at one polarity or the other, corresponding to the the 1's and 0's of
Prices are subject to change. We will confirm your order or notify you of any
price change. You then have the opportunity to accept or reject a price change
prior to shipping.
If you do not find what you are looking for contact us
and we will try to get it for you
Please contact us to find out what
discount is available to corporations, hospitals, universities, school
districts, armed service entities, and government agencies. For personalized
service, please call Art at 1-877-784-1212.