LiteOn drive

Hello All
I have a LiteOn LH-20A1L-05 and for some reason when I go to my computer it dosnt show that I have a DVD + R RW when I have one in the drive. However it dos show when Im using a DVD - R RW. DVD shrink still will burn + or - using the drive but Nero wont. Its the weeardist thing. Can anyone tell me what I may be doing wrong. Whats the most used for makeing DVD copys. + or -



I would use DVD+R or DL+R over the -R media.