Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Make sure you understand the different DVD formats

DVD+R and DVD+RW formats are supported by Philips, Sony, Hewlett-Packard, Dell, Ricoh, Yamaha and others.DVD-R, DVD-RW and DVD-RAM formats are supported by Panasonic, Toshiba, Apple Computer, Hitachi, NEC, Pioneer, Samsung and Sharp.DVD R+ appears to be a lot more popular than R-. While more recent players will play both formats, some of the older one will not. [Check the comments on this. Several people say that R- is more popular. They may be right.]If you use the disk for data backup, don't be a sucker for false economy. You'll lose your data. I bought some cheap R- disks a year ago and found them so unreliable as to be unusable.This review has elicited some excellent comments from other users, which are well woth reading. Click on the "Comments" link below.