CD Speed 99 ver 0.66 beta
This screen shot from CD Speed99 illustrates read
speed (in green) vs. spindle speed (in yellow). In the image above from the
72X drive, and the one below from the 40X Sony drive we see that that both are
operating on the CAV principle. Constant Angular Velocity CD-ROM's rotate the
disk at a constant speed, resulting in slower data transfers at the beginning of
the disc. In the case of the 72X drive, data rates start off at about 44X and
work their way up 72X by the end of the disc even as the RPM lowers. From the
numbers we can see that the average speed is about 65X.
In the second example with the 40X Sony CD-ROM drive, we
see almost Constant Angular Velocity hovering just above 16X. As the laser moves
progressively closer to the outside edge of the disc the read speed increases, to
a maximum of 35X, yielding an average of 26X across the entire disc.
Kenwood Demo Disk
||24X SCSI |
||3 Frames/s |
The Kenwood Zen Demo Disk works by flashing 50-odd high
res images over and over. By this operation it is able to calculate the transfer
rate at which data is flying off the disc, the rate at which individual frames
are displayed, and the amount of data being handled by the video adapter. The
Kenwood 72X drive scored significantly higher than each of the comparison
CD WinBench 99
||Winmark 99 results 1040
||Winmark 99 results 413
The results of our WinMark 99 test say it all.
Performance more than twice that of the reference 40X Sony drive.