Xref: utzoo comp.sys.mac:9940 rec.video:2351 sci.electronics:1723 Path: utzoo!mnetor!uunet!husc6!uwvax!oddjob!gargoyle!ihnp4!homxb!mtuxo!mtune!mtunk!io!granjon!edsel!arrow!pierce!cbdkc1!czei From: czei@cbdkc1.UUCP Newsgroups: comp.sys.mac,rec.video,sci.electronics Subject: Re: Hard disk back-up on a VCR ? Message-ID: <2613@cbdkc1.ATT.COM> Date: 14 Dec 87 13:19:42 GMT References: <9823@shemp.UCLA.EDU> Reply-To: czei@cbdkc1.UUCP (Michael S. Czeiszperger CB 1L334 x4952 ADMIN) Organization: AT&T Bell Laboratories, Columbus Lines: 24 In article <9823@shemp.UCLA.EDU> khayo@MATH.UCLA.EDU (Erazm J. Behr) writes: >There is apparently >a product (add-on board, software, cables etc.) that >lets you back up a hard disk on a VCR (VHS) cassette. At OSU, I've helped design some hardware which could be used to accomplish such a thing using Sony's PCM adapters. Unfortunately, the adapters expect constant data at a throughput around that of a CD, which is too fast for hard disks connected to the Mac with no DMA. Since we are just using the Mac for development, this wasn't a problem for us, but it ruins the chances for easily making it work for backup. A solution I've considered is a kind of Stop/Start protocol which would 'imbed' the Mac data into the faster digital stream going onto videotape at a constant rate. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Michael S. Czeiszperger | "HELP! I'm stuck in 3B HELL !!!" Contracted to AT&T | Phone: (614) 860-4952 Unix Systems Administration | UUCP: cbosgd!dkc1!czei 6200 E. Broad Street | Disclaimer: "The above opinions are those Columbus, OH RM 1L334 | of a large rodent with sharp teeth" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~