What are the good and bad points of the QIC-11 and QIC-24 tape formats?
We have a Sun which supports both formats and I would like to know if one
of these formats is better in some sense.
I would also like to know how to calculate dump(8) tape length for a say
9 track cartidge tape. I do not have the source for Sun dump but I suspect
that dump regards all tapes as 8 track (8 data plus parity). My guess is also
that 9 track cartridge tape is used by writing 8 data bits and 1 parity bit.
Is this the case?
The formula I am using right now for calculating tape size is as follows:
I use the tape size written on the cassette with no safety margin!
density = 10000 (thats ten thousand)
size = 450 feet
My guess is that one of the following formulas is correct:
(tape size)*((9 tracks)/(8 tracks))*(safety factor)
(tape size)*(safety factor)
where (safety factor) is something like 0.9 or 0.94 (depending on who
you talk to).
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