#Image Storage Problem
06-Oct-91 19:54:16
Sb: #3963-#Image Storage Problem
Fm: CSA/CA 76077,2774
To: STEPHEN HARRISON 76216,2753
Stephen,
Best bets:
1) Get an an erasable optical drive. Expensive.
2) Get a Bernoulli – 90M capacity per cartridge.
This may not be enough for long sequences. Advantage is
good speed, on-line random access, doubles as backup device.
3) 25M floppy – limited media availability – why bother?
4) Tape backup. Fine if you want to maintain space on the
hard drive to load/unload segments as needed. File by file
method is best, and directory is stored @ head of tape.
Problem is slow access, difficulty on some models of
specifying files to be retrieved, impossibility of
retrieving ANY files if bad tape transfer, media problem
within a single file, or media problem in directory. While
same is true of other media, tape dropout is not uncommon
(ask anybody who uses audio cassettes. Tapes can also
break if the BOT or EOT (beginning, end-of-tape) sensor
gets dirty.
5) VCR backup. Very slow, does use redundancy. Expensive for
what you get. Bad idea.
Kevin Krell – Computer Support Associates