Mac Book Air 2012
HD > get Info > Sharing & Permission
1) Original settings
System : read & write
Wheel : read & write
Everyone : read & write
2) Changed to :
System : read & write ( no change)
Wheel : read & write ( no change )
Everyone : change to NO ACCESS .
Result: I can not access the MBA anymore .
Question : how can this action be undone or how can the original setting be reinstalled ?
Thanks for any advice
Chris
Which version of the OS is it running?
If you're running 10.7 or later, your system has a 'Recovery Mode' partition which you can use to boot your system. Hold Command-R as you power on, then you can repair your disk permissions (via Disk Utility), which should fix the problem.
OS X: About OS X Recovery - Apple Support
If you're on 10.6 or earlier you can boot into single-user mode by holding Command-S as you power-on the system. This will get you into a shell environment, where you can use the command-line: chmod 777 / to reset the boot drive permissions.
How to start up your Mac in single-user or verbose mode - Apple Support
Hi,
Thanks .
I solved the issue via Target Disk Mode . Connecting to another IMac screen, the HD on Mac Air became accessible.
I changed the permission again to its original settings.
After that, the Mac Air started up normal .
Chris
HD access rules of MBA : Sharing & permission
