Instruct: Classify the given review into positive or negative sentiment.
Query: BEWARE - MANY DEFECTIVE UNITS

I purchased one of these units and it worked for about two weeks and then just stopped working. I tried it on two separate computers (work and home) and it could not be accessed. I googled "cruzer micro problems" and found a lot of other people have experienced similar issues. These units are definitely hit or miss, which isn't how it should be. My Lexar flash drive works fine in both computers so I know its not a problem on my end.