Copying to CD

My wife noticed a problem last night with our computer. She was trying to
copy a file for work to a CD and was not allowed to do so. Whenever she
tried she got an error message saying " D:\ is not accessible. Incorrect
function. "
The drive seems to work to play games and things like that but will not
allow files to be copied to the D drive.
Anybody have any clues ?
.

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