Originally Posted by Psychokitty
This card does not say HDSD, SDHD, etc. Just "SD" and "4GB".
...Should a 150x card be assumed HD just by it's speed alone?
It's HC, not HD. Anyway, cards with a [number]x speed rating are normal SD cards, SDHC cards have class ratings for speed - Class 2, 4, 6... (number corresponding to minimum write speed in MB/s).