I've got lockups occurring on a 15" unibody mid-2009 MBP that last for 30 seconds at a time and then magically clear up. I get a beachball during this time. Happens in various apps (safari, mail, textedit, adium, firefox, etc). Activity Monitor shows DiskIO going to zero during these lockups - seems like any app that accesses (read/writes) to disk hangs during these times. I've looked at System Profiler, smartctl, hardware diagnostics, and disk utility and all say my drive is fine. Also ran xbench and the numbers look ok. Seems other people are also having problems in the official support forums: http://discussions.apple.com/thread.jspa?threadID=2075399&start=15&tstart=0 Has anyone else seen this? Trying to figure out if this is a general issue or a few of us have bad hardware. Apple support is giving me the usual run around.