I have two questions about the CD/DVD Speed Quality test that I’ve been wondering about since I got my new 1640 the other day.
I have noticed with my 1640 that no matter what read speed I specifiy for the quality test, the drive starts out slow and ramps up, like from 4x at start to 8x at finish. When I checked many of the posted resutls for media tested with other folks drives I see the same trend, even if they have maximum set as the speed. My Lite-On 1693 will stay at whatever speed I specify, so if it starts at 4x, it’s 4x all the way thru.
Is this normal? Does having a fixed vs variable speed affect the results in any adverse ways? Or give some advantage?
I have also noticed that scanning the same disc in the Lite-On 1693 will give a different quality result than in the Benq 1640, even if the number of errors is roughly the same. Lets say you are 10% of the way through a scan, and there have been 20 PIFs, and the PIEs are very close to the same, the Lite-On will always be a lower score. Is this because it does not report Jitter?
What affect does Jitter (or the lack of it reporting) play in the assessment of quality with this program?