Summary: I purchased this to max out my mid 2009 MacBook Pro. I was hesitant to tinker as I have had no problems in 2 years. For the first week it worked great. the I started getting slow downs and system hang ups. I used tech tools deluxe and found hundreds of bad sectors.
Summary: I ordered one to install in my MacBook Pro and it worked rather slowly for two weeks until it eventually failed with white screen of death. I then reinstall from scratch (I had imaged it with Clonezilla at first) doing all update and recovering with time machine.
Summary: I gave this 2 stars for fit and runs silent. Ordered two,installed one in my 15" Macbook Pro, after three weeks of used the drive failed. Try disc repair and tried to reinstalling operating system but keeps failing with errors.