Hi, I have a mid-2010 Mac mini (Macmini4,1) running up-to-date Snow Leopard, with a single 320 GB hard drive. The machine acts as a web server and stays on 24/7 since January 2011, but sleeps when not being accessed. In January 2012, I happened to run verify from the Disk Utility, and it said the drive needed repairing (file and directory counts were out, iirc). I successfully repaired the disk, and all was well again. This week, I had cause to force power-off this machine using the power button, so I checked the disk again, and again it needed repairing - (file and directory counts were out by a few - <10? ). Again I was able to successfully repair the disk. I have another Mac mini (a mid-2011 model) which is always on in the same way, and an old MacBook (Core 2 Duo), both running Lion. I've run a disk check on these machines, and the disks are both fine. The machine is generally very stable, so I have no reason to think there's a problem other than the report by Disk Utility. So, my question is - is it typical to get some corruption like this (with an abrupt power-off), and of course, should be avoided, or is the corruption an indication of something more serious? Should I be making hasty plans for a disk swap? Advice appreciated.