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#1
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CD burning speed determines read speed?
I've gotten the impression that the speed a CDR/CDRW is burned at
determines the maixmum speed that the burned data can be read at afterwards. In case I'm wrong, let me explain what has happened. A CD was burned at 32x. It was inserted into a different CDRW drive which can only read at 32x max. It was reading the data extremely slowly, having to pause after every instant, and it finally would give up at a certain file. The faster drive was able to read the CD fine, and the slower drive never had problems with other CDs. So I'm guessing that the CD being burned at 32x might have something to do with it, as perhaps the slower drive can't quite read up to 32x (even though it's rated 32x read). Is my conclusion right? Is there another explanation for this? I don't understand why it should matter what speed a CD is burned at. Thanks, David |
#2
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"David K" wrote in message
... I've gotten the impression that the speed a CDR/CDRW is burned at determines the maixmum speed that the burned data can be read at afterwards. In case I'm wrong, let me explain what has happened. A CD was burned at 32x. It was inserted into a different CDRW drive which can only read at 32x max. It was reading the data extremely slowly, having to pause after every instant, and it finally would give up at a certain file. The faster drive was able to read the CD fine, and the slower drive never had problems with other CDs. So I'm guessing that the CD being burned at 32x might have something to do with it, as perhaps the slower drive can't quite read up to 32x (even though it's rated 32x read). Is my conclusion right? Is there another explanation for this? I don't understand why it should matter what speed a CD is burned at. The burn speed has nothing to do with the read speed. When you burn you are writing information to the disc. Once it is there it's there - it doesn't write different information depending on the speed you write at. You could write at 1x or 52x and you would get the exact same disc. The only difference is how long you have to wait around. The drive that was reading the disc slowly was clearly having difficulty reading the disc. It was getting a lot of errors, so a lot of info had to be resent. The user isn't aware that this is happening - all you see is a slower transfer rate. Why did it read fine in another drive? Who knows. Maybe the other drive has better error checking. Maybe the original drive has slight alignment problems. Maybe it was a much hotter day and the CD expanded slightly. Whatever it is, it's got nothing to do with burn speed. You aren't the first person to suggest this. I remember reading an article way back (when 4x burners were the new kid on the block) about burning PSX games. It said they had to be burnt at 2x. At 1x the disc would be skippy (only play at half speed), at 4x the disc wouldn't be read because it was too fast for the playstation! Gareth |
#3
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On Sat, 19 Jul 2003 13:17:02 -0700, David K wrote:
I've gotten the impression that the speed a CDR/CDRW is burned at determines the maixmum speed that the burned data can be read at afterwards. In case I'm wrong, let me explain what has happened. A CD was burned at 32x. It was inserted into a different CDRW drive which can only read at 32x max. It was reading the data extremely slowly, having to pause after every instant, and it finally would give up at a certain file. The faster drive was able to read the CD fine, and the slower drive never had problems with other CDs. So I'm guessing that the CD being burned at 32x might have something to do with it, as perhaps the slower drive can't quite read up to 32x (even though it's rated 32x read). Is my conclusion right? Is there another explanation for this? I don't understand why it should matter what speed a CD is burned at. Thanks, David With a "perfectly" burnt disc, the pits burnt into the surface would be exactly the same no matter what speed you burn the disc. There is no perfect disc, they all deviate slightly from the ideal... In general the faster a disc is burnt, the more accurate the timings must be, the more important the media is accurately identified instead of a "generic" burn strategy (firmware identification from ATIP on the disc). So, the faster the disc is burnt, the more likely it has more errors, areas that are unreadable by ANY drive, but fortunately the error correction built-in can compensate up to a point (but the reading is slower). The problem comes in when there are so many errors that a correction can't be made, then the file is unreadable. It was just random chance that the two drives you used to burn and read happened to both have a 32X write/read. Since the 32X drive is getting older perhaps it's a bit dusty inside, or lower quality to begin with, or as with all things, drives do get a bit better at reading as the technology matures. You might try burning at slower speeds or different media if it's important to read from older drives, and update the CDRW drive's firmware if possible. "Usually" burning at +32X can be done easily on "any cheap generic disc" but when it comes to the faster speeds the particular burner and media need be more carefully considered if you want the end result to have as few errors needing correction as possible. There are a number of online website reviews of drives, associated forums where you might find suggestions for the best media to use for your particular drive, or if there are any issues unique to it. Dave |
#4
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"David K" wrote in message ... I've gotten the impression that the speed a CDR/CDRW is burned at determines the maixmum speed that the burned data can be read at afterwards. In case I'm wrong, let me explain what has happened. A CD was burned at 32x. It was inserted into a different CDRW drive which can only read at 32x max. It was reading the data extremely slowly, having to pause after every instant, and it finally would give up at a certain file. The faster drive was able to read the CD fine, and the slower drive never had problems with other CDs. So I'm guessing that the CD being burned at 32x might have something to do with it, as perhaps the slower drive can't quite read up to 32x (even though it's rated 32x read). Is my conclusion right? Is there another explanation for this? I don't understand why it should matter what speed a CD is burned at. Not really. The slower drive is older and would have a less-powerful laser and worst error-correction. The faster you burn a CD the more chance there is of being errors on the CD or 'pits' (OK, I know they're not actually pits) not burned perfectly. A more modern reader/writer with a more powerful laser (it takes a more powerful laser to read/write faster) has a better chance of reading these areas. I suggest that, if you are going to burn discs to be read by less-than-state-of-the-art readers you burn them slower. The older the hardware that is going to read them the slower you should burn them. The stated read speed for your 32x is for pressed disks (with a higher reflectivity index than CDRs or CDRWs) and almost zero errors. -- ~misfit~ --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.500 / Virus Database: 298 - Release Date: 10/07/2003 |
#5
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Thanks for the responses. I'll think about a new CDRW/DVD combo drive
being my next upgrade. It sure would be nice to not have to wait 10 minutes to burn a CD at 4x, too. David |
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