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| Posted by | Jan Willem |
| Posted on | 22/05/01 21:25 |
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Reading speeds...Also reading of a CD has some things you might want to look at, in the specifications of a drive there is always the read speed. But the real read speed of a drive can differ from time to time. Most modern drives use different reading types. The reading you will find in the specifications is the reading type of the fastest reading mode.
Because the data density across the whole CD surface is constant, there is more data on the outer tracks. This means that some parts of the CD are read slower than other parts of the CD.
There are different types of reading a CD:
CLV: A CLV drive reads the data at a constant transfer rate. The drive spins faster at the inside of the CD. Because speeds went up so high, this is not very satisfying for high speed drives anymore, and therefore they invented CAV.
CAV: CAV drives spin at a constant spin rate, which means the transfer rate is slower on the inside tracks and faster on the outer ones. A 32x CAV drive generally means that the fastest speed the drive will read is 32x.
P-CAV: (From the CDSpeed2000 site) P-CAV is a combination of CLV and CAV. The transfer rate increases until the drive reaches it's maximum speed (CAV). From that point the drive will slow down and the transfer rate will be constant (CLV). Because P-CAV drives reach their maximum speed much sooner than CAV drives, the average transfer rate should be higher.
Z-CLV: (From the CDSpeed2000 site) Z-CLV is very similar to P-CAV with the only difference that the drive starts reading in CLV mode.
Z-CAV: Z-CAV takes advantage of the fact that the outside tracks are longer than the Inside, but the information on this reading mode is as good as nothing, so I can't say more about this. The documentation I found about this also says it's not a standard. It's a fact that several newer drives support this reading mode.
Conclusion:
There are several methods of reading your CD's. The methods are based on the principal that a CD has more data on the outer tracks of a CD than on the inner tracks. The CAV and CLV methods are okay, but P-CAV and Z-CLV are methods that are smarter and improve the reading speed of the drive. If you want to read at lot of data on a the fast possible way, you should go for a drive that is capable of reading in the Z-CAV, P-CAV and/or the Z-CLV mode.
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Posted by sushil (guest) on Tuesday 21 August 2007 08:52
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