I wanted to share the experience I’ve had recently in trying to solve a major problem with my Pioneer DVR-110D drive, in an external enclosure.
Like many people, I had some serious problems in getting the drive to work properly. In particular, the drive would stop writing about 3% into a burn and I was producing coasters by the dozen. Nero 7.0 would, for example, give a “device not available” message.
It didn’t matter what software I used (Roxio or Nero 7.0), what media (various, including Verbatim DVD-R and DVD-RW), or what firmware for the drive I used (I had upgraded the frmware to v1.41), there was no difference.
Eventually, I did some further research and discovered that the external enclosure itself was the likely culprit. It was a Sumvision 5.25" USB 2.0 enclosure. Apparently it uses the Prolific PL-3507 chipset and firmware, which has been known to cause write issues in both DVD-RWs and HDDs (see here for an interesting thread: http://missig.org/julian/blog/2004/06/10/prolific-pl3507-firewire-device/)
In theory, all should not be lost as you can upgrade the enclosure’s firmware (see here: http://member.newsguy.com/~siccos/PL3507%20Firmware.htm) However, just my luck and it seems I have the “A” version of the chip, so couldn’t do so. Apparently others with “B” and “C” chips have been able to upgrade their firmware and had some luck.
Bottom line: I ended up replacing my enclosure with a Vantec Nexstar 5.25". It took me about 30 mins to extract the DVD-RW from the Sumvision and replace it in the Nexstar. And hey presto! Worked forst time, and no more coasters since. I also suggest you upgrade your drive’s firmware at the same time too.
While I know this may not be the answer you may have been looking for, it may just save you a lot of time and hassle by just buying a new enclosure. Hopefully though you can upgrade your firmware with the utilities above.