I recorded pictures on my Plextordrive, but the disk I recorded to now shows it's FULL...no space available (not true!!)...how do I (re)open the CD so I can add to the CD contents?? I didn't record in any special mode, nor did I request the disk be 'CLOSED'!! Any suggestions??

You can't! Once a disc is closed, that's it!

Before you burn, make sure the box "Close Disc" or "Finalize Disc" is unchecked.