The Memorex Pocket CD-R incorporates the 8cm CD-R. The Pocket CD-R can be used with CD-R cameras, CD/MP3 personal recorder/players and CD-RW computer writers, offers 210MB of storage and can fit into a standard CD tray.
I have 2 of the CD-Mavica cameras. The CD-1000 uses these disks fine with no problems. However with the CD-500, about 2/3 of the disks have problems. I know it is not my camera causing this problem, I know several people with the same camera that have the same problem. If you have a CD-500, use the TDK brand disks, I have not had a problem with any of them.
The pocket cdr's are becoming more and more popular lately with some digital camera's now using them. Personally, however, I've found that they work great in normal cd burners and come in handy for use with larger presentations (particularly powerpoint) that you'd have to waste a whole normal size CDR to burn or take the risk of saving to a Zip disk and then not have any means to retrieve it. I've also found they come in handy for resumes as they give you a somewhat more professional look. The only downs..