In OS X Yosemite and earlier, Disk Utility can repair file permissions on a startup disk. So it turns out that if you have a Mac OS X Lion on RAID 0 that you can’t run Verify/RepairPermissions on your hard drive, at least via Disk Utility. I gather from a number of message boards that users are unable to run Disk Permissions Verify and Disk PermissionsRepair on their RAID drives with Ok, i am new to Xserver stuff. I am wondering how can i repair disk/files permission on a RAID disk attached to the Xserve. I used Disk Utility comes with the OS, It see the RAID disk but does not allow me to perform repairing. Repairing permissions is only effective on the boot drive. Repairing If you've ever done much Mac troubleshooting, you've probably heard about "repair disk permissions" as a solution. Most users don't deal with permissions at all, so this can be a baffling idea. The permissions here are really file and directory permissions, but they’re generally called “disk permissions.” Your Mac won’t automatically repairpermissions except while installing or upgrading Mac OS X itself. Some Mac hiccups and startup issues can be resolved by repairing disk permissions in OS X. Disk permissions allow your Mac to control what users have access to files and folders on your Mac. RepairMac Disk Permissions. Start repairing the corrupt Mac disk with Stellar Volume Repair application to rebuilds it doesn’t support repairing of RAID Learn about using Disk Utility to verify or repair disks. Open Menu Close Menu; you will need to start up from your Mac OS X Install DVD and use Disk Utility It won't cure all of your Mac's ills, but a quick and easy first step toward bringing a sluggish Mac back to health is using OS X's Disk Utility to repair disk permissions.