So after extensive research on this forum and consulting the QPxTool website, I started to search for BenQ DW-1650s and PX-716As for use with an IDE-USB adapter (or, eventually, enclosure) for CD quality scanning purposes. Then, I found a PX-716UF (did not even know it existed) on shopgoodwill.com and won the auction @ $10.99 (ended up paying exactly $25 in total in the end). Today I unboxed it and connected it to my desktop and immediately after turning it on I noticed a high-pitched whining noise; it is constant and persists no matter what the drive is doing or not doing. Obviously, that did not seem very promising to me but nevertheless I inserted a data CD-R (CMC Magnetics) I burned recently with my WH16NS40 (fw 1.03). QPxTool reports “no media” for the PX-716"A" and no CD shows up in the file manager either (except for the disc in my WH16NS40 currently). I just tried a pressed audio CD and I get exactly the same results. After inserting a CD (again, for both discs) the status LED is constantly on for some seconds and green. Then, it starts somewhat rapidly blinking orange or amber 2 times before pausing briefly and repeating this continuously.
After seeing another PX-716UF thread I checked and the included PSU is a Plextor branded unit rated for 12 VDC/3A. I should also mention that I have verified that the whining noise comes from the drive itself and not the PSU. I see there is a “self-test” switch but I am not sure if I need Plextools to view the results (I only run Linux on this desktop as I do not have a Windows license for it and my only computer with Windows runs Windows 10). I do not know if the drive even came with a Plextools disc; I believe it only came with Roxio Toast and WinDVD discs.