Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Sometimes corrupts images on Canon SD1100 IS

I have taken 360 photos with this card on my Canon SD1100 IS. Three or four of the images have been corrupted. It is possible that my SD card reader is not compatible with SDHC cards. However I have seen corruption directly on the card via the camera's PLAY mode. It will show an "Unidentified Image" error message. I don't want to risk losing any more photos, so I will be buying a new SD card.