If it is write-protected, then it is a CD-R or DVD-writable that has been written on -- once written, you cannot "format" it, nor "erase" any files.
Such is the "design" of "write-once" disks.
If it is a CD-RW or a DVD-RW, then you can "erase" the disk, because it has been designed to be "rewritable".
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