I bought "five" of the Benq OEM DW1640s from NEWEGG about a month ago and placed them in my PC ( PC-01 ) which I already had five of the Pioneer DVR-A08XLB's which are now in my second PC ( PC-02 ).
With the Pioneer DVR-A08XLB's I could burn five disc (movies files 4.5gb) simultaneously and never had a problem...
The software I would use was Nero ( up to four burners at the same time ) or, Alcohol 120% ( up to 16 burners at the same time )... I would use Ritek G05 disc at 8x speed, and all five disc would be finished in about 8 minutes.
When I would try to use all five of the DW1640 simultaneously the fastest the G05's will burn is max 3.9x ( I never even reached 4X ) :a ... Even if I just tried using two of the DW1640 at the same time, I would still get the same results.
Now each of the DW1640's work great on their own :iagree: ... I can burn G05 at 8x speed and the disc will be done in 8 minutes, but only if I use one drive at a time.
I have also tried two other types of media and still have gotten the same result.
I tried to burn with all five simultaneously using the stock firmware that they came with, but had no luck... I then tried BSJB still no luck then BSKB, then BSLB with QSuite v2 using OverSpeed... It just didn't matter all five max burning speed was still 3.9x sometime would avg 2.5x.... I even tried installing newest back to oldest (all drive had same firmware at all time) nothing changed.
I even switched the Benqs and the Pioneers drives from one PC to the other PC and would get the same result... The Pioneer's would still burn five disc simultaneously in about 8 minutes no matter what PC they were in, and the Benq's would take about 23 minutes no matter what PC they were in.
I did notice in the BIOS of the ASUS mb the information for the Benq drive:
DEVICE : ATAPI CD DRIVE
VENDOR: BENQ DVD DD DW1640
LBA MODE: SUPPORTED
PIO MODE: 4
ASYNC DMA: MULTIWORLD DMA-2
ULTRA DMA: ULTRA DMA-2
I noticed that my second IDE cable was showing (were two DW1640's are connected) multiworld DMA-2, so I uninstalled it and then it came back as ultra DMA mode-2...
It was the same with the Siig controller, stating the other three drives listed as multiworld DMA-2... I also tried to uninstall and reinstall but they still come back as multiworld DMA-2.... As I meantion before I have tried useing just the two drives on the second IDE cable at the same time but still no faster the 3.9x :sad: .
Now with the Pioneer's drives they always show as ultra DMA mode-4 even with the Siig controller and no matter what PC they are in.
Maybe this is why I've never seen a DVD Duplicator with Benq drives in them before.
PC-01 = Intel P4 3.2 ghz, Asus P4C800-E Deluxe mb, Zalman cpu fan, 1gb of Corsair ram, WD 120HD pata, Maxtor 200HD sata, Maxtor 250HD pata, (Five) Benq DW1640 drives (two are on second IDE m/s and the other three are on Siig controller), ATI 800XT video card, Siig UltraATA 133 PCI controller, Antec 480 TrueBlue power supply, SilverStone TJ06B case....
PC-02 = Intel P4 3.2 ghz, Abit IC7-G mb, Zalman cpu fan, 1gb Mushkin ram, Maxtor 200HD pata, Maxtor 300HD pata, Maxtor 300HD sata, [B]SIX[/B] Pioneer DVR-A08XLB's (all connected to two Siig controllers), ATI 9800 Pro 128mb video card, Two: Siig UltraATA 133 PCI controllers, PCMCIS 600 watt power supply, Thermaltake Armor (black) case.
( I use Logitech's wireless keyboard & mouse with Belkin's usb kvm switcher to go back and forth from one pc to the other, O' yea, my monitor is my Mitsubishi 62" DLP rear projection TV with direct PC DVI input ).