Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Diskappointed

I have used SanDisk Compact Flash Memory cards and had great results (Nikon 2MP digital camera and Cannon 3MP digital camera). This Secure Digital Card started showing errors from the beginning, and then got worse. Unable to use at all in my Coolpix 4800 after a couple weeks. Lost some great shots (I know they were great because I saw them in the viewer when I shot them) because of errors on this card. Glad I got the [...] but still feel like SanDisk ripped me off.