2009年10月17日 星期六

CD到底有啥問題?

這很多人在討論,在這篇裡
http://www.diyaudio.com/forums/pc-based/153174-best-cd-ripper-eac-dbpoweramp-jrmc-4.html#post1948410

It's because the error detection and correction of CD/DVD data is more robust than that of music CD. Also, data CDs aren't subject to the read/write offset problem of music CDs. You could consider the latter to be a trivial error, as it only changes the amount of silence at the beginning and end of the song by a tiny amount. But it does make it a little messier to determine whether you got a bit-perfect rip of your CD - especially since you don't know a priori what the data were supposed to be. Thus the use of AccurateRip and read/write offset correction for helping with this task.

I've ripped about 1000 CDs, many of them as old as around 1984 when I first started buying them. I'd say maybe 3 percent of them had some kind of problem. There's a freeware called KProbe2 that works for Lite-On drives. It checks C1 and C2 errors on CDs among other things. I checked the problematic CDs with KProbe2 and found they usually had C2 errors, or a much higher than normal incidence of C1 errors. It's complicated a bit by a pretty large variance in quality of audio CD error detection and correction in different makes and models of computer CD/DVD drives.

3%這數字...實在不算高,
而且是,3%的CD有問題,97%沒問題,
3%之中,出問題的data想必更是低得很...
我的CD頂多300張,算來只有十張會有問題...

CD是有問題,但,你難得會碰到!
窮緊張個啥啊~

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