Maarten ter Huurne wrote:
>Multiple rotation speeds would explain why my CD-ROM drive makes a lot of
>noise when reading the table of contents (when a CD is just inserted), but
>is not noisy when playing audio (single speed) or accessing files on the
>outer edges of the disk (lower rotation speed needed for the same
>throughput).
Yes, modern CD-ROM's operate at variable speeds. A 32X CD-ROM (at least my
Plextor SCSI) does 32X on the outer region, but 14X on the center region.
It will be at a speed between that in the middle.
With the supplied software I can force the CD-ROM to work at a certain
speed. That is 14X-32X (standard), 8X-20X or 8x/4x/2x/1x constant speeds.
Older CD-ROM's may have different speeds (1X for audio and 1 or more
different data speeds), but the speed is constant throughout reading the disc.
On a side-note, Kenwood is making new CD-ROM's (up to 72X!), that have 8
lasers to read consecutive sectors and store them in a buffer. While a
'real' 56X (can't get higher than that) makes a lot of noise and often only
reaches about 48X max, the Kenwood 56X actually DO reach a constant 56X,
while maintaining a MUCH lower rotation speed (I think it was like 12X or
something). That makes them low-noise and keeps the wear and vibration to a
minimum.
About reading CD-R's and CD-RW's in older CD-ROM's, the keyword is
MULTI-READ. New CD-ROM's support multi-read, and recently there are also
Discman's which are Multi-read.
A friend of mine has a reasonably old CD-ROM which can't read blue and gold
CD-R's, but it will read my silver (Mitsui SG) CD-R's perfectly! It's a
matter of reflection. Some non-multi-read CD-ROM's will fail the disc
completely, others will skip a lot.
Greetz,
Patriek
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