A file is not deleted from a full CD-R disk
When deleting a file from a CD-R that is full, you get a message:
There is not enough space on [drive].
[MB] is needed to recycle this item. Click Delete to delete the file instead of sending it to the Recycle Bin.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB954802.