"
Mike,
Here are the results of my testing. The CD I used to test digital audio
extraction speed is the album "No Angel" by Dido. It's 12 tracks for a total
time of 51:52 and a total size of 524.5 MB.
All individual track extraction times are an average of 3 consecutive
attempts with Toast Audio Extractor, timed by hand with a stopwatch.
Track 1: "Here With Me," time of 4:14, size of 42.8 MB.
Time to extract: 14.49 sec ("overlap" setting ON), 14.58 ("overlap" setting
OFF)
Speed: 2.95 MB/sec (overlap on), 2.94 MB/sec (overlap off)
Track 12: "Take My Hand," time of 6:42, size of 67.8 MB.
Time to extract: 14.33 sec (overlap on), 14.39 sec (overlap off)
Speed: 4.73 MB/sec (overlap on), 5.06 MB/sec (overlap off)
For comparison, here are the same tests performed on the stock Apple DVD-ROM
drive (Hitachi GD-7000 8x drive):
Track 1:
Time to extract: 28.14 sec (overlap on), 27.92 (overlap off)
Speed: 1.52 MB/sec (overlap on), 1.53 MB/sec (overlap off)
Track 12:
Time to extract: 23.82 sec (overlap on), 24.11 (overlap off)
Speed: 2.85 MB/sec (overlap on), 2.81 MB/sec (overlap off)
So it seems from these tests that the Que drive is roughly twice as fast as the stock DVD-ROM drive at digital audio extraction.
I also performed a couple ripping tests with SoundJam MP 2.5.2 on the same CD.
Rip to 160 KHz MP3
DVD: 5:35
Que: 6:02
Rip to AIFF
DVD: 5:31
Que: 3:05
It appears that SoundJam's two-stage encoding (extract, then encode) on the external Firewire drive (I blame it on the Toast drivers, but I'm not sure) limited the overall performance when ripping to MP3s. I could here the drive
spin down when the extraction was complete and the encoding started, then
spin back up to extract the next track. The internal drive extracts and
encodes in one pass, boosting performance a bit. But when ripping straight
to AIFF, the Que whoops up on the DVD-ROM, even though SoundJam is still
doing two-stage ripping (extract, save, extract, save, etc...).
I saw pretty much the same behavior with iTunes ripping to 192 KBps MP3s,
with similar results. (5:36 time with the DVD drive, 6:36 with the Que
drive).
And that's all the tests I feel like performing tonight. :-)
...
Cheers,
Dave Corder"