I have a MBP Summer 2010, with the original hard drive inside (a 320GB Seagate Momentus HDD). For quite a while now, I noticed that my mac was very slow, starting Word can literally take up to two minutes. I did a speed test of the HDD with Code: dd if=/dev/zero of=/tmp/output.img bs=8k count=256k and get an average write speed of 26,9Mb/s. Actually, I expected this value to be somewhere around 90Mb/s (correct me if that expectation was wrong). Also, when looking at the system profiler, I found out that the drive was talking SATA1 with my mainboard, although both mainboard and HDD support SATA2. So here are my guesses: 1. my hard drive starts to fail (although SMART status says it's okay) 2. there's a problem with the HDD<->mainboard connection Any hints on this?