Here are the transfer rate tests for the 5 discs I’ve recorded so far.
This is an .ace archive, rename dltrt.ace.zip to dltrt.ace and open it as an .ace file. Without .ace I couldn’t get the set of pictures below 100 KB.
These discs were recorded both on the 1640 as well as my NEC 3500A; discs 3 and 5 have been recorded on the 3500, the rest on the 1640. The transfer rate was capped at around 9.5x as the drive is on a PCI IDE controller. Disc 3 was read twice, the transfer curve looked a lot better when the maximum speed was set to 8x.
Now these discs are certainly readable at a resonable speed, I’ll likely stick with recording them on my 3500A, despite having a lower recording quality. Regardless of whether or not I have WOPC enabled or disabled, more often than not the BenQ will mess up at the layer break - that is, it will give me an error when attempting to write to layer 2.
The attached picture nec.png gives an idea of the writing quality of the 3500A (firmware 2.1B).
dltrt.ace.zip (35.5 KB)