CDs that are not round tend to have unbalances. This is not exactly good for the drive. There are round disks in about the same size. They hold up to 210 MB of data. Iīd prefer those.
The advatage of the USB device or CF card is that you can update parts of the data without needing new media. These media are much more robust than CDs.
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If it isnīt broken, it doesnīt have enough features yet.