everytime I try burning a DVD in my Macbook Pro I get an error message:The drive reported an error:sense key = MEDIUM ERROR
Sense Code = 0x73, 0x03

I've a Mac OS X 10.5.5. Drive: Mat****a UJ-857E.

I've tryed several different medias (DVD-R, +R - Sony, imation, etc); different speeds of recording; and different softwares: Toast, iDVD, DVD Studio Pro; and I get always then same error message.
At the same time, I can still read DVDs normally.

Any suggestions of procidure to solve the problem?