Cheers for the replies,guys.
@Foxbat, yeah,the Imations are Ricoh discs . Another thing that cropped up is that the drive now refuses to recognise blank CD-R discs, burnt CD-RW discs (says they are empty when they have 430MB data on them, MCC 10X discs), and takes 2 minutes to recognise burnt CDs. I think I have a bum drive, and I'll be returning it on Saturday.
Thanks for the help