I also forgot to mention that I installed the drive in an Bytecc enclosure with USB 3.0 connectivity to my laptop (it has 2 USB 3.0 ports) and would still not work with it. As for the Win XP desktop, I formatted the drive, re-installed XP and a couple of apps, and I also updated the mobo's BIOS and the Pioneer's firmware (to 1.20). I was able to get DVDFab to burn the SmartBlu (25GB) disc, but it was painfully slow - 3 hours later it was at around 12% completed and it said it would finish in 8 more hours or so, so I cancelled the burn. Should I just give up on the old WinXP system? I was looking at a ZT system with Intel iCore 7-2600 3.4GHz, 16GB RAM, 2TB HD, 12x BluRay writer, dual monitor support, with Win7 HP 64-bit for $800 from Costco ($200 off reg price). (I tend to do some video editing every once in a while.) What do you think?