i have microadvantage 1004(btc 1004). It used to work fine for me on memorex 4x +rw till i upgraded it to 0048 and since then it is not burning my dvds at 4x with nero or roxio. Nero shows that it has burned sucessfully but when i reinsert the cd windows reports it to be blank. Hence i tried burning it at 2x and it burned fine and was recognised and works fine. Now roxio drag to disc when i asked to format the disc only formats it at 4x and hence when i try to format the disk it is still blank. Hopefully this will be fixed in the next 049 firmware as i had sent a mail to them also but does anyone know when are they planning to release the new 0049 firmware.