How do you remove the whole content from a TDK DVD+R?

If it says DVD+R then it's write once only.

If it says DVD+RW or DVD-RW then it's rewriteable.

I can guarantee, however, that it will NOT say both.
 
A DVD+R is a write-once optical disc with 4.7 gigabytes (GB) of storage, generally used for non-volatile data storage or video applications.
 
RW indicates it is indeed rewritable. Open it, press control A to select all files and right click, delete.
 
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