s8922967@ipc02.tmc.edu (Murray John GILBERT) (05/20/91)
In article <ronald.3568@ecl014.UUCP> ronald@ecl014.UUCP (Ronald van Eijck) writes: >I've asked this question before but without any response so I'll try again. > >I've heared that there is a backup system that uses a VCR. The only thing >neaded is a VCR, a cable and software. Is there someone who has any info > >Thanx, I don't know much, but if far distant memory serves correct, it uses an` 8mm video tape, don't know how much it stores but I think I worked out in a round about way that it was using the PCM (pulse code modulation) stereo sound track or something of the tape, 16 bits per sample at 31250 samples per second, ie 2 * (16/8) * 31250 bytes per second of tape = um, 125000 bytes persecond. Therefore 125000 * 60 = 7 500 000 bytes per minute = 225 000 000 bytes per half hour tape (450x10^6 for 1 hour tape, etc for 1.5 hour tape) If use the half speed then of course this is doubled, but quuality (or should I say reliability) is reduced. Personally I wouldn't trust using video tape. Not after seeing the results on the telly what a tape that has been recorded on or played too many times. A small inconvenience on video, but major disaster for computer data store. Gee, that what a lot of stuff for someone who doesn't really know anything about it. Anyone out there who really knows about this stuff. That's all from me, adios amigos, Murray --------------------------------------------------------------------------- Murray Gilbert email: s8922967@mackay.mqcs.mq.oz.au It seems that Arabs and Israelis are like oil and water, so how do you make them mix ? Easy : Soap ha ha ha, yeh sick isn't it ---------------------------------------------------------------------------