14.04 – how to format a burned dvd (r+w)


hii i want to format a burned dvd in ubuntu….Thus i tried a lot using various options like

cdrecord dev=/dev/sr0 blank=fast

but its not working error is ( i am using ubuntu 20.04)

wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
Error trying to open /dev/sr0 exclusively (Device or resource busy)... retrying in 1 second.
Error trying to open /dev/sr0 exclusively (Device or resource busy)... giving up.
WARNING: /dev/sr0 seems to be mounted!
wodim: Device or resource busy. 
Cannot open SCSI driver!
For possible targets try 'wodim --devices' or 'wodim -scanbus'.
For possible transport specifiers try 'wodim dev=help'.
For IDE/ATAPI devices configuration, see the file README.ATAPI.setup from
the wodim documentation.

can anybody suggest a best solution for formatting the already burned dvd(r+w)