My Mac thinks blank CDs are full DVDs. Why?

My PowerMac G5 at work thinks every blank CD-R I put into it is a full DVD. The first time it responded with "There are no volumes accessible by a Macintosh" in the error dialog. When I tried other discs I get no error, no "You have inserted a blank disc" message, and the disc does not mount in the Finder. When I look at them in Disk Utility, it thinks they are DVD discs with Ok available. Any thoughts on how I can fix this? Recently I installed DVD2OneX to make copies of some of my DVD's. Might that have something to do with it?
Thank you in advance for any assistance.
PowerMac G5 Dual 1.8Ghz Mac OS X (10.3.9)
PowerMac G5 Dual 1.8Ghz Mac OS X (10.3.9)

Try trashing the Finder prefs (com.apple.finder.plist) and log out/log in.

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My Mac thinks blank CDs are full DVDs. Why?

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