WARNING WARNING WARNING ...
You should avoid these cd cards at all costs. They cause huge problems with high speed drives. Most of the CD CARDS are not balanced and spinning at such high speeds can cause the drive to become mis-aligned. We had hundreds of complaints about these discs causing drives to stop working altogether.
That's why they are no longer popular. There was a time when every man and his dog were producing them but they are just not worth it.
You're better off using the smaller 5cm discs. They may not be as cool but you'll run into alot less problems.