The differance in DVD drives
it is my understanding (though i could be wrong) that a DVD driver will only read a disk, a CDRW/DVDROM drive will write to CD's but only read DVDs, a DVDR drive will Write to blank DVDs (a 1 time process) and DVDRW drives will write to ReWritable disks in a similar way to using a hard drive, using a program like InCD.
As for your discontinued netbook, try doing a search on EBAY, there are often old system pulls for sale.