Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BEWARE - the discs this machine uses are hard to find!

I ordered this DVD recorder/VCR from Amazon recently. I took note of the reviews warning that the machine is very fussy about which types of DVD-Rs it will record to. Apparently, it only records to 4x speed DVD-Rs (and only certain brands). Well, after spending the day searching all over town for specific brands of 4x DVD-Rs, I came home and cancelled my order with Amazon. The 4x DVD-Rs are being phased out. The manufacturers are now making either 8x speed or something called "downward compatible 1x-8x" speed. Apparently neither of these two types work with this recorder. Anyone who buys this machine should be warned of this limitation.If you think you want to purchase this DVD recorder, make sure you can get a big supply of 4x speed DVD-Rs before they all disappear. Read the rest of the reviews here to find out which brands of 4x DVD-Rs work.Of what use is a DVD recorder if you can't find discs to record on?