Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Avoid this junk

I also experienced the slowdown/stoppage problem, but managed to take about 50 photos at my birthday party with my Pentax Optio 555, which I had received the day before with the Sandisk 256mb SD card as a birthday present. The next morning, I tried to download the photos, but could not do so because the files were inaccessible. I tried downloading from two different card readers and from the camera itself, but no luck. The card had simply gone bad. Luckily, the card was purchased at a good camera store and they sent me a replacement within a few days. It's also a Sandisk, but I've got my fingers crossed.I'm obviously not a big fan of Sandisk, after having lost a lot of really good pictures that can't be re-created. Avoid Sandisk SD cards and buy either a Panasonic or a re-badged Panasonic under the Simpletech or Kodak brands.