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weird dip in Disc Quality scans on BenQ DW1620

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weird dip in Disc Quality scans on BenQ DW1620

Postby dodecahedron on Sat Feb 11, 2006 1:13 pm

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.
Attachments
28-October-2005_00_14_TOSHIBA_DVD-ROM_SD-M1712_J004_TransferRate16.png
Transfer Rate test on Toshiba SD-M1712 J004 DVD-ROM
28-October-2005_00_14_TOSHIBA_DVD-ROM_SD-M1712_J004_TransferRate16.png (50.4 KiB) Viewed 492 times
28-October-2005_00_26_BENQ____DVD_DD_DW1620_B7T9_TransferRate8.png
Transfer Rate test on BenQ DW1620 B7T9
28-October-2005_00_26_BENQ____DVD_DD_DW1620_B7T9_TransferRate8.png (49.18 KiB) Viewed 491 times
28-October-2005_00_38_BENQ____DVD_DD_DW1620_B7T9_DiscQuality.png
Disc Quality test on BenQ DW1620 B7T9
28-October-2005_00_38_BENQ____DVD_DD_DW1620_B7T9_DiscQuality.png (54.41 KiB) Viewed 497 times
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Postby dolphinius_rex on Sat Feb 11, 2006 3:20 pm

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.
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Postby [buck] on Sat Feb 11, 2006 7:04 pm

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.
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Postby Scour on Sat Feb 11, 2006 8:01 pm

Hello!

My 1640 make also a slowdown when scanning, at the 130-145 MB-mark
Benq DW 1640, LG GH-20N, Pioneer BDR-208
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Postby MacClipper on Sun Feb 12, 2006 1:52 pm

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.
Last edited by MacClipper on Sun Feb 12, 2006 10:22 pm, edited 1 time in total.
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Postby eric93se on Sun Feb 12, 2006 1:55 pm

It not a glitch or malfunction. Its a laser power calibration.
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Postby Scour on Sun Feb 12, 2006 2:24 pm

eric93se wrote:It not a glitch or malfunction. Its a laser power calibration.


When reading?
Benq DW 1640, LG GH-20N, Pioneer BDR-208
Crucial M4, Sandisk SSD, Plextor M5S, Sandisk Ultra Plus, OCZ Petrol 256GB

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Postby eric93se on Sun Feb 12, 2006 9:39 pm

Yes. My 1640 also does it.
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