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| Thread ID: 56649 | 2005-04-11 10:32:00 | Shattered CD in drive!!! | Monkfish (7860) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 343731 | 2005-04-14 02:08:00 | You're assuming constant rpm. A CLV drive maintains constant data rate by slowing down as it reaches outer tracks. www.cdrfaq.org |
PaulD (232) | ||
| 343732 | 2005-04-14 02:20:00 | Oh dear, I do know that, but I edited out my description of the difference betwen CAV and CLV because I decided it was irrelevant, even though you wrote CAV in your first posting. I'm not assuming constant rpm. I am assuming that a 52X has to spin at 52X300 for some period. Otherwise it can't ever reach 52X. |
Graham L (2) | ||
| 343733 | 2005-04-14 02:37:00 | 300 at the edge would be faster than 1x. From the link "In terms of actual rotational speeds, a disc being read at 1x spins at about 530rpm when reading near the center of the disc, slowing to about 200rpm at the outer edge. The linear velocity is constant, ranging from 1.2 m/s to 1.4 m/s depending on the disc. Discs with longer playing times (e.g. 74 minute discs vs 60 minute discs) use the slower velocity. It has been stated that, at a rotational speed equivalent to about 50x at the inside of a disc, the polycarbonate starts to deform and the disc becomes unreadable. Experiments (e.g. an episode of the "Mythbusters" TV show from 2003) have demonstrated that discs will warp when they get up around 25,000 to 30,000 RPMs. However, recent 52x drives only read data that quickly from the outside of the disc, actually reading at about 21x near the inside. This requires a speed of 10,000 to 12,000 RPM, which is safe for discs in good condition. Reading at 52x from the very inside of the disc would require a speed of about 27,500 RPM, and read data at 137x near the outside. " |
PaulD (232) | ||
| 343734 | 2005-04-14 03:07:00 | So? Read my first posting. A 48X or 52X will spin faster than 300 rpm average. The forces increase with the square of the speed. 15k or 12k or 10k rpm is going to "test" the disks. Some will burst. | Graham L (2) | ||
| 343735 | 2005-04-14 03:16:00 | So, just pulling the rpms back closer to 10,000 than 15,000. You get this sort of thing when self described as "pedant" :p | PaulD (232) | ||
| 343736 | 2005-12-28 01:24:00 | My Windows Installation CD shattered in my Memorex DVD drive at the computer repair shop where my computer was getting a new motherboard . I had used the Memorex drive for making movies but always chose the slower speed to insure a good movie . I suppose there was no speed option when loading a program from that drive . Should I go ahead and use that drive again and continue making my movies at a slow speed or should I consider this drive faulty? My Windows installation CD is destroyed . Does Windows . com help in replacing CDs that are ruined like this? Sandy |
stumble (7861) | ||
| 343737 | 2005-12-28 01:49:00 | If you look at the "guarantee" or "EULA", you will find that the media on which the software is supplied is the only thing which they are prepared to replace if it's faulty . :D The software doesn't qualify . I don't know what proof they will want that you had a genuine one . . . have you got a bag of fragments? A CD which disintegrates is a faulty CD . The drive isn't faulty . |
Graham L (2) | ||
| 343738 | 2005-12-28 02:05:00 | Had one drive repeatedly grenade 6 discs in the same day . It sounded like the banshees of hell . . . it went supersonic so I know it wasn't the fault of the cd's . . . it was just a bad program that SONY admitted to and replaced the CD-RW . I took it apart the first 4 or 5 times and it wasn't easy to get the shards outta the greased areas and the little rack gears and such, but I made it every time . Those pieces are SHARP! Use extreme caution handling them! I know of what I am speaking here . I just could not see this as repeated failures of defective cd's . . . I got wise and tried a couple of different brands and the drive scattered them all . . expensive discs and cheepos too all the same . SONY knew they had a problem . I returned the drive to the store (Staples) that sold it and they said they had a few returns that very day for the same problem . It was all handled very nicely . . and I got another SONY with an online download for the driver and never had another problem . But . . . I tell you honestly . . . it wasn't the cd's: the speed went so far up, only dogs could hear the rpm . I have never heard a motor turn that fast . And . . SIX TIMES TOO! |
SurferJoe46 (51) | ||
| 343739 | 2005-12-28 02:56:00 | Microsoft (NZ) are absolutely el-crappo when it comes to replacing legitimate licenced media. A lot of their employees should have been drowned at birth. Especially their local helpdesk staff. | Greg (193) | ||
| 343740 | 2005-12-28 04:54:00 | I've heard this heaps of times - its the disk. But I have had perfectly fine CDs that have then exploded in nasty Aopen drives. I suspect its a bit of both. Bad CD but lost it in the bad drive. |
pctek (84) | ||
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