Because there is really two logical volumes file systems written to the Hard Disk, Disk Utility won't let you repair the permissions on the Hard Disk it never could, either. What it would do before, in Snow Leopard, was just go ahead and repair the permissions on the only logical volume on the Hard Disk. However, under Lion, it has two logical volumes one you cannot see , so it doesn't know what you really want to do, so it doesn't allow that to happen.
Jan 14, PM. Page content loaded. There is no reason to repair permissions unless you get an permissions error message.
Repairing permissions prior to upgrading is simply a preventative measure to assure that all the system preferences are correct before applying a system update or upgrade. You can only repair permissions on a disk volume. Selecting the main drive entry when a drive has multiple volumes will prevent being able to repair permissions as will happen if you select a non-system volume. There is nothing harmful to repairing a drive or repairing permissions, so accidentally doing it is not a problem.
What you don't want to do is accidentally erase a drive, but that's pretty difficult to do because Disk Utility always asks if you're sure it's what you want to do.
Also, you cannot erase the active system volume. I'm not sure where you picked up your information but your sources are not to be trusted or you misunderstood what you read. For disk repairs use Disk Utility. For situations DU cannot handle the best third-party utilities are: Disk Warrior ; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4. TechTool Pro provides additional repair options including file repair and recovery, system diagnostics, and disk defragmentation.
TechTool Pro 4. Versions 1. OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni , JAW PseudoAnacron , or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep. Dependence upon third-party utilities to run the periodic maintenance scripts had been significantly reduced in Tiger and Leopard.
These utilities have limited or no functionality with Snow Leopard or Lion and should not be installed. OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X.
Personally I would avoid most commercial anti-virus software because of their potential for causing problems. I would also recommend downloading the shareware utility TinkerTool System that you can use for periodic maintenance such as removing old log files and archives, clearing caches, etc. For emergency repairs install the freeware utility Applejack. If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the commandline.
Note that AppleJack 1. AppleJack 1. There is no confirmation that this version also works with Lion. When you install any new system software or updates be sure to repair the hard drive and permissions beforehand. I also recommend booting into safe mode before doing system software updates. You can make a bootable clone using the Restore option of Disk Utility.
You can also make and maintain clones with good backup software.
My personal recommendations are order is not significant :. Carbon Copy Cloner. Silver Keeper. Super Flexible File Synchronizer. Synchronize Pro! Synk Standard. Additional suggestions will be found in Mac Maintenance Quick Assist.
I really don't know whether you could "Repair" permissions by selecting the device before or not being one who only "repairs" permissions when necessary. However, the device doesn't have any permissions to repair as it has no file system, therefore no permissions. The formatted volume on the device is the only thing that would have a file system that could possibly be repaired. So, it makes sense that you cannot "repair" the permissions of the hard disk device, but you can "repair" the file system's permissions.
Prior to Lion if you selected a device that had a single volume as would be the case out of the box, Disk Utility would simply repair the permissions of the single volume. Once a device was partitioned into more than one volume Disk Utility would no longer repair permissions until a volume was selected. Lion actually has two volumes installed. One volume is invisible, the Recovery HD.
By the way, Drive Genius has also had a substantial upgrade just this week. Why there is a need to repair Disc permissions? Disk Utility will do its best to identify and repair any permissions problems that may be affecting performance. To boot into Safe mode: Turn your computer off, then press and hold the Shift key while your computer boots. It makes sure all permissions are the way they should be. BitRaser for File Permanently wipe files and folders, and erase traces of apps and Internet activity. I ran the disk utility and verify permissions.
This is why Disk Utility won't repair permissions if you select the device instead of the volume. Nothing in DU really changed, wrt permission repair. If you are to select, which 1 are you to I was told the top 1 that I have pictured here. Laugh if u will, I just don't know why there are even 2 icons are what the difference is I only have 1 hard drive Thanks a lot though I'm sorry to waste my time trying to help you understand.
Apparently you don't wish to be educated. And, I know a lot more about safe booting than you do. What does that mean that it never could on the Hard Disk? You then say but that it would go ahead and repair on the only logical volume on the Hard Disk? I don't know the difference but sounds confusing to me.
Hard Disk or Volume? Your assuming something more here in your waving fists reply! Because of my paranoia since upgrading to Lion X and intend on using Time Machine next I didn't want to run into problems that I'm seeing happen in forums, etc Shutdown your Mac. Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
Hold these keys until the computer restarts and you hear the startup sound for a second time. Release the keys. Select the startup disk from the list of volumes. Click the First Aid tab. To check permissions, click Verify Disk Permissions. Release the shift key when you see the login window. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder.
To leave safe mode, restart your Mac without pressing any keys during startup.
This could be an issue with a corrupt hibernation file. Deleting this file could help. Here's how to delete it requires admin privileges on the computer :. Hard disks eventually fail, even when best care is taken.