Checking the Filesystem on Mac OS X Simply hold down Command-S as the system boots to get into single user mode. To check and fix the filesystem run fsck -fy: This article comes from NetAdminTools: http://www.netadmintools.com/ The URL for this story is: http://www.netadmintools.com/art563.html Copyright 1997-2007 NetAdminTools.com. Read our Terms of Use.