I don't think that you can
You can hide the file with some applications but the space is not available to wite over.
I think that a CD-RW is a read only UDF file system.
You can copy the files that you want to somewhere, re-blank the CD, then start over.
Or I guess that you could make an .iso of the CD, mount it, alter it, blank the CD, write the .iso to CD.
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