buying an internal DVD/CD ROM and the different DVD formats.

[Bassim]

This is a newbie question.
I am thinking of buying an internal DVD/CD ROM for my computer .
There is lots of DVD/CD formats out there.
My question is : do I have to make sure that my DVD rom is able to read all DVD formats (DVD+R, DVD+RW, DVD-R and DVD-RW)?
I will mostly use it to view movies/play PC games on DVD [if it is available on a DVD instead of CDs] and occasionally I might come across a DVD r/W.

Thanks for your help

[El Torro]

all dvd's will be read