home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!destroyer!cs.ubc.ca!newsserver.sfu.ca!sfu.ca!tpang
- From: tpang@fraser.sfu.ca (Tsui Ting Debbie Pang)
- Subject: Re: Caddyless CD-ROM Drives for the Mac?
- Message-ID: <tpang.721990049@sfu.ca>
- Keywords: CD, caddy, CD300i, Photo CD
- Sender: news@sfu.ca
- Organization: Simon Fraser University, Burnaby, B.C., Canada
- References: <1992Nov9.195547.14783@cs.ucla.edu> <1992Nov10.022058.3245@reed.edu>
- Date: Tue, 17 Nov 1992 08:47:29 GMT
- Lines: 27
-
- rseymour@reed.edu (Robert Seymour) writes:
- > It's not to protect the disk, but to ensure higher accuracy in reads.
- >If the disk moves even slightly, bits will register wrong (i.e. the beam won't
- >reflect back directly into the sensor). The reason these aren't as prevalent in
- >audio CD players is that it doesn't matter if you miss a bit on an audio
- >recording, you can't tell the difference (8 bits at 44.1MHz, which is around
-
- I thought CD audio samples at 44.1kHz with a 16 bit resolution.
-
- >150K/sec, all of which goes into the sound output).
- > However, in computers, each bit is crutial, hence the caddy. I wouldn't
- >suggest buying a player that doesn't have a caddy, since most people don't
- >change disks very often anyway (it's a pain, but so are bad reads from large
- >files). Also, currently the only player to support multi-session Kodak Photo CD
- >is Apple's CD300i, though more are expected based on the same Sony mechanism.
- >Some other players currently support Photo CD, but won't accept images after
- >the first session.
- >--
- >Robert Seymour rseymour@reed.edu
- >Departments of Physics and Philosophy
- >Artificial Life Project Reed College
- >Reed Solar Energy Project (SolTrain) Portland, OR
-
- Strike two! :)
-
- David Tse
-
-