Andere Leute haben exakt die gleichen Probleme:
Here is a repost of the tests I ran last month. All media was reported as 8x.
Here are the data rates through each burn zone since this writer is zCLV. Data rates were taken from Activity Monitor sampling at 1 sec intervals. I personally can't fit any more data onto a DVD-R so it's safe to say that this is a full burn.
Media Type: TDK 8x DVD-R coded as TTG02
Toast/drutil reports media as: 8x
Filesize: 4473.3MB
Reported time to burn: 6:52 (412 sec)
Actual time to burn: 12:43 (763 sec)
Time 0:00 = 2.5MB/s - 3MB/s (2x)
Time 1:47 = 5MB/s - 5.5MB/s (4x)
Time 6:31 = 7.5MB/s - 8MB/s (~6x)
Time 11:16 = 5.5MB/s - 9MB/s (~6.5x) data rate very inconsistent in this zone
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Media Type: Generic 8x DVD-R coded as FUJIFI..LM0
Toast/drutil reports media as: 8x
Filesize: 4473.3MB
Reported time to burn: 6:52 (412 sec)
Actual time to burn: 12:45 (765 sec)
Time 0:00 = 2.5MB/s - 3MB/s (2x)
Time 1:47 = 5MB/s - 5.5MB/s (4x)
Time 6:31 = 7.5MB/s - 8MB/s (~6x)
Note: This disc changed velocity only 3 times. the other discs changed four times.
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Media Type: Fuji 8x DVD-R coded as TYG02
Toast/drutil reports media as: 8x
Filesize: 4473.3MB
Reported time to burn: 6:52 (412 sec)
Actual time to burn: 12:53 (773 sec)
Time 0:00 = 2.5MB/s - 3MB/s (2x)
Time 1:48 = 5MB/s - 5.5MB/s (4x)
Time 6:31 = 7.5MB/s - 8MB/s (~6x)
Time 11:21 = 6.5MB/s - 9MB/s (~6.5x) data rate very inconsistent in this zone
The media seemed pretty consistent across the board. As you can see, the drive never hit the 11MB/s data rate to claim 8x in these tests. All of these tests were done with Buffer Underrun Protection (BUP) on. It's interesting that with BUP off I would get an underrun error in the last burn zone MAYBE when the drive was trying to hit 8x. That brings up a nasty possibility...is the PowerBook even able to transfer the data fast enough to the drive to write at 8x? The 5400RPM drive should have no problem but I had a buffer underrun consistently at this point in the burn. The BUP could also account for the inconsistent data rate in the last burn zone as it struggled to keep the data coming in.
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