Sorry, never Heard of T copy??
DVDs can NOT be written to unless they are a -RW (rewritable).
As to DVD-R (+R) When you write data to the Drive, youcan add data, or continue to write to the DVD-R or +R disk until You Close it OUT. Once closed out you can NO longer write or modify files on the DVD disk.
Store Bought DVDs are "ROM" disk- ROM = "Read Only Media"