I have a older Memorex CD-RW which can be read/written fine on my older computer with Adaptec Easy CD Creator. When I try to use this disk on my new computer with Sony DRU500A and new version of Roxio Easy Media Creator, it's invalid or incompatible media. Any ideas to fix the disk so I can write with the DRU500A? The drive can read it after I write something to it with the old computer.