Well maxtor has a warranty that will cover the drive, you will need to check the maxtor drive with a program from maxtor.
http://www.maxtor.com/en/support/downloads/powermax.htm
If it does turn out to be defective from the test then either return it to the store if your warranty is still good there, if not maxtor wont have a problem taking it back, you will just need to look at their site for RMA's and you will have to only pay the S&h there, it should come to about 5-10 dollars to return it depending on priority or insurance, I recommend insurance as it wont cost too much extra and may save you money or get you a new hdd
Do look into it tho, if it is bad, maxtor will send you a new one.