[CentOS] formating DVR-RW

[snip]
>> I have DVD-RWs.
[snip]
>   I am assuming (and we all know what that
means :) ) that the OP has such a disk.
[snip]

It is not an assumption.  OP has Re-Write (RW) disks.

(JIC:
https://www.google.com/search?q=dvd-rw+definition&oq=dvd-rw&aqs=chrome.1.69i57j0l5.5006j0j7&sourceid=chrome&ie=UTF-8
)

-- Fred