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weird dip in Disc Quality scans on BenQ DW1620

PostPosted: Sat Feb 11, 2006 1:13 pm
by dodecahedron
if anyone with experience with BenQ DW1620 can tell me:
on every Disc Quality scan i make with this drive, i have this dip in the read speed curve, around 0.1GB. see the pic.
it appears when using different kinds of media (+R, -R, +RW), different brands/MID codes, different burn speeds, different content (data, video, CDSpeed test disc).
had it when used B7P9 and also now with B7T9.
basically i can only attribute it to the hardware.

note: this dip doesn't appear when doing a transfer rate on the disc in the same BenQ nor in my Toshiba DVD-ROM drive.

what's up with this dip ? does it mean anything ? is it some sort of malfunction ?

Dolphinius Rex once commented to me that this is (might be?) something to be concerned about.

PostPosted: Sat Feb 11, 2006 3:20 pm
by dolphinius_rex
I'm less inclined to think it's anything serious now that I've been working with the hardware for some time. I think it's just a glitch.

PostPosted: Sat Feb 11, 2006 7:04 pm
by [buck]
I believe Erik Deppe (author of CD Speed) has stated that some BenQs basically go to sleep at the 100MB mark and CD Speed has to "wake up" the drive.

PostPosted: Sat Feb 11, 2006 8:01 pm
by Scour
Hello!

My 1640 make also a slowdown when scanning, at the 130-145 MB-mark

PostPosted: Sun Feb 12, 2006 1:52 pm
by MacClipper
dodecahedron, this seems to be a rather common glitch in the BenQ DW16xx series of burners but fortunately for the DW1620, the latest B7W9 firmware seems to have eliminated the glitch.

Give it a try.

PostPosted: Sun Feb 12, 2006 1:55 pm
by eric93se
It not a glitch or malfunction. Its a laser power calibration.

PostPosted: Sun Feb 12, 2006 2:24 pm
by Scour
eric93se wrote:It not a glitch or malfunction. Its a laser power calibration.


When reading?

PostPosted: Sun Feb 12, 2006 9:39 pm
by eric93se
Yes. My 1640 also does it.