I have NEC 3500A(G) and it is in a BYTECC 5.25" USB 2.0 External Enclosure, Model "ME-320U2" (http://www.newegg.com/app/ViewProductDesc.asp?description=17-145-314&depa=0). It is hooked up to my laptop, which has usb 2.0. The firmware of the drive is the official 2.18 (it came with 2.16 and I flashed it). It will burn dvd+r and +rw but wont burn dvd-r (haven’t tried dvd-rw). I used sony dvd+rw and imation dvd+r, and both worked. I used the free dvd-r’s that I got from newegg for buying my burner as well as some fujifilm dvd-r’s. I have tried dvdxcopy express, dvdxcopy platinum, nero 220.127.116.11, dvd decrypter, and dvd shrink. I have made seven dvd-r coasters. I don’t remember exactly what error it gave me though. Would it help to upgrade to a different firmware, or did I just get a bad drive. I don’t see why it works with dvd+r but not dvd-r. if you need any more info let me know. Any help you can give me is greatly appreciated. I have read through your site and have not seen an answer to this, so I thought I would post it. Thank you.