I bought a stack of CD/RW (Memorex) discs to use on an old laptop on which Ubuntu 11.10 is installed. The CD device that I have does not read DVDs, so I had to get CDs. I had no problem using most of the discs as RW (I did not have to format them, they worked straight out of the box for read, write and rewrite), however there are a couple of the discs that Ubuntu can't detect. The CD drive accesses the discs and shows that a device is mounted and ready to use, however they are read only. I can't even format them on Ubuntu. I took one of the offending CDs to a Vista system and it could see the disc. A ROXIO popup asked if I wanted it BLANK. I selected yes and it said it was being formatted. The format completed successfully. I was not given a choice of format type, however when I put the CD back into the laptop, Ubuntu seen it as read only, which means it is still unusable. What happened here? Why would a CD/RW be read only? Is there something that I can do to reset these CD/RW discs to RW? Read only is useless on a blank CD.