One thing to mention about double-sided disks: they're not removable from cartridge. This means that if you intend to use them in a Generation 3 DVD-ROM drive, you're out of luck. Single sided type 1 (I think) disks, on the other hand, can be removed from cartridge and put in Gen. 3 DVD-ROMs such as those in the iMac, Pismo, and G4.
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Simon Kornblith
Computer Consultant
Programmer