nivek@cmu-ri-rover.ARPA (Kevin Dowling) (09/10/85)
CD cleaner: I still think CD cleaners are kind of silly but I take pretty good care of my discs and haven't had any skipping problems that weren't quickly wiped off. But for those interested I saw that Radio-Shack has a lower cost version of some CD cleaners I've seen. Page 26 of the new RS catalog: $12.95 Laser MTBF: The playing time of my year-old Sony D5 CD player is approaching 1000 hours (average of 3 hours/day) I'm wondering if anyone out there has had their laser fail yet (on any player) and what time and money cost it entailed? They story is that the laser is supposed to last 2K hours or more so I'm not worried about my particular player but some of you I'm sure have had their player for some time now. nivek Aka : Kevin Dowling Bell: (412) 578-8830 Arpa: nivek@cmu-ri-rover Mail: Robotics Institute Schenley Park Pgh, PA 15213
hunter@oakhill.UUCP (Hunter Scales) (09/10/85)
In article <236@cmu-ri-rover.ARPA> nivek@cmu-ri-rover.ARPA (Kevin Dowling) writes: >CD cleaner: > >I still think CD cleaners are kind of silly but I take pretty good care of >my discs and haven't had any skipping problems that weren't quickly wiped >off. But for those interested I saw that Radio-Shack has a lower cost >version of some CD cleaners I've seen. Page 26 of the new RS catalog: $12.95 The instructions on some of the CDs I have purchased state explicitly that CDs should be wiped with a soft cloth (*no liquids) in a radial direction (i.e. from the center of the disc outward.) This makes sense given the way that the information is layed out in concentric rings and the type of error-correction scheme. A tangential or circular scratch would destroy a lot of data and, more importantly, have a better chance to destroy the redundant info, as well. Since *all* of the CD cleaners that I have seen involve wiping the disc while spinning it, doesn't it seem reasonable to assume that these devices are not only unnecessary but also undesirable? -- Motorola Semiconductor Inc. Hunter Scales Austin, Texas {ihnp4,seismo,ctvax,gatech}!ut-sally!oakhill!hunter (I am responsible for me and my dog and no-one else)
dave@rocksvax.UUCP (09/12/85)
After waiting for 2 weeks for some other part for my Yamaha CD-X1, they
decided that the laser output looked a little weak and while it was still
under warranty would replace that also. I tend to play the machine
about 3-4 hours or more a day. The unit is 1.5 years old now...
Dave
arpa: Sewhuk.HENR@Xerox.ARPA soon to be Sewhuk.HENR@Xerox.COM
uucp: {allegra,ihnp4,rochester,amd,sunybcs}!rocksvax!dave
ns: "Sewhuk:HENR801C:Xerox".ns@Xerox.ARPAdca@edison.UUCP (David C. Albrecht) (09/16/85)
> A tangential > or circular scratch would destroy a lot of data and, more importantly, > have a better chance to destroy the redundant info, as well. > > Since *all* of the CD cleaners that I have seen involve wiping > the disc while spinning it, doesn't it seem reasonable to assume that > these devices are not only unnecessary but also undesirable? > Virtually all the spinning cleaners I have seen do not spin the wiping surface concentric to the disk but rather offset it so that the edge of the wiping surface intersects the disk at the center point and thus is perpendicular at the edges of the wiping surface to the disk tracks. David Albrecht