I upgraded the firmware on my Sony DRU500 to 2.1a and now when I try to burn a dvd with Ulead Video Studio or Ulead DVD Factory I get the following error: 93006:1:0 Drive is not ready. DVDDecrypter and Roxio seem to work fine and I have tried ALL the updates ULVS8. I've noticed a lot of posts related to this model dvd writer but I've never had an issue till I upgraded the firmaware. The reason I upgraded is I bought a 25pack of DVD's gthe other day and when I got home I realized they were 4.x. There was a note inside stating that the firmware needed to upgraded on the dvd writer to support the 4x speed so that's what I did. I don't care so much about the speed as I do getting the software to work with the writer. I have other issues with ULVS but this is the first time neither of their products will work.