I bought one of the I/O Magic Drives on sale from Staples over the weekend, it ended up being a 1670. I immediately flashed to FW version 1.03 (used MediaCodeSpeedEdit to modify the 1.03 FW as it was originally recognized as an ATAPI drive rather than Benq, which is normal). After flashing to 1.03 it properly is recognized as a Benq 1670. My first attempted burn was done at 8x with 16x media in an external USB enclosure, however the burn stopped writing data after a few hundred MBs, I know it was up to around 7.5x when I walked away from the computer. I then tried a Transfer Rate Test and got the result as shown below - the speed shifts down as you can see. I tried a burn at 4x with 4x media and there were only 3 slight shifts in speed which I’m guessing are probably OPC kicking in, and the resulting burn quality was very good in a PIE/PIF scan. I then installed the drive in my tower (slave drive) and it is set as UDMA mode 4, and the TRT in my tower is identical and has the same downshift in speed. I then flashed to 1.02, briefly tried a TRT (which started at around 2.5x), then flashed back to 1.03 and the TRT remains the same. I have not tried another 8x or faster burn but I will do so in a moment, however I’m assuming the same issue will exist.
So does anyone know what might be causing this other than a bad drive, or has anyone seen similar behavior? So far as I can tell it has no issues at lower speeds and also with a full 4.7GB disc the TRT will get up to about 10x or a little higher without issue, it just has the downshift in the TRT and the 8x disc I burned stopped burning data after a few hundred MBs.