Instruct: Classify Amazon reviews into positive or negative sentiment
Query: only works intermittently on my mac

I have the Sony Memory Stick PC Card Adapter (MSAC-PC3) and it's very unreliable on my mac (powerbook, osx 10.3.8). Most of the time it just doers not work at all. When i insert the memory stick the little red light flickers a bit but then nothing. If I shut my mac down completely, leave it off for a few minutes, then boot it again then the crd reader will sometimes work. All in all not a very satisfactory product for mac users.