Actual devices of /dev

Dear Fellow,

how can we find, which entries in /dev/ represents actual devices?

for example, i have a dvd writer, now i dont know whether linux has
identified by writer or not. So there are multiple entries for dvd in /
dev/ such as:
dvd dvd0 dvdrw dvdrw0 dvdwriter dvdwriter0

so how can i know which entry actually represent my device to mount?


Anees Haider