Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Space is 650 MB not 700 MB

I bought the Khypermedia CD-R 50 pack, the cd space was mentioned 700MB but my drive ( khypermedia drive) always complains about its size if the data > 640MB.I tried to call Khpermedia service center but the phone was never picked up. I left 3 voice mails no response after 4 months. Later on I tried to call merchant and complain about its size they said we will take it back if it is not opened and used which is not possible. At last I end up with paying more for less space.Amazon beware of this product.