the superdrive is apples coined term for a DVD-RW drive.
I have a 1.6GHz G5 with the superdrive. Apple sells the drive as a DVD-R/DVD-RW/CD-R/CD-RW/DVD/CD drive, but my drive also reads and writes DVD+R and DVD+RW.
The drive can read and write to dvd's and CD's. as long as its a supported format. With apple, and CD-R, CD-RW, DVD-R, and DVD-RW can be written to. some drives support the DVD+ formats, but not all