Can a 48x CD-R play DVDs

Only if it is a combo 16xDVD read, 48xRead/Write, and 24xReWrite drive. Ordinary CD writers cannot read or write DVD discs. Ds come in 650 MB to 800 MB capacities, while DVDs come from 4.8 GB to double or four times that capacity, even though they look exactly like CDs. For DVD movies, you may prefer a six-channel sound-card and 4.1 or 5.1 surround-sound speakers.

Only if it is a combo 16xDVD read, 48xRead/Write, and 24xReWrite drive. Ordinary CD writers cannot read or write DVD discs. Ds come in 650 MB to 800 MB capacities, while DVDs come from 4.8 GB to double or four times that capacity, even though they look exactly like CDs. For DVD movies, you may prefer a six-channel sound-card and 4.1 or 5.1 surround-sound speakers.