I think I've had this issue with 10.7 as well. I used to be able to go into console and check in the System log and it would show any of the "disk0s2 io error" messages indicating a failing hard drive. (usually someone brings in a computer that frequently pinwheels, and has a failing hdd)
But I'm not seeing these messages in console under 10.7 or 10.8. Known issue? Somewhere else to look?
I work for the Department of Redundancy Department
But that's not an io error message. The kernel is simply stating that it has equated the BSD root (i.e., "/") with the disk volume formerly known only as "disk0s2".
(Edit: this message is a reply to joemikeb's, not virtual1's.)
Last edited by ganbustein; 09/06/1210:21 PM. Reason: Clarify what "But ..." refers to.