How do I restore my disk permissions?

I'm running 10.6.7 on a 2.8GHz i5 iMac. Was having issues so I ran disk repair followed by repair disk permissions in Disk utility (something I know now that I should not have done). Now I'm locked out of my external drives (padlocks on the desktop icons). Tried to switch permissions back to "read and write" in the "get info" window of the external drive but it keeps reverting back to "custom". Tried running some terminal commands that was supposed to restore my permissions but got "drive not found." Now what?

Yes you can erase the drive and reinstall OS 10.6 from the original disk.
1. Put the disk in and restart the computer while holding the C key down. (The letter C.)
2. When the computer boots you will see the beginning of the OS installation, and have to select a language.
3. On the next screen there is a menu bar. Click Utilities on the menu bar and select Disk Utility.
4. When DU is running, select the hard drive in the left hand column, format should be Mac OS extended journaled, then click Erase.
5. When that task is done, quit DU and proceed with the installation. It will take some time.
6. The computer will restart after the installation is completed and show you an awful noisy welcoming screen.
Then you have to enter information about yourself.
7. Run Software update to get to OS 10.6.8.
Now you can go to the App store and find your previous purchases. You will not have to pay for them again. And you do not have install them one at a time. If for example you want 10.9, and your computer can handle it, go directly to 10.9.1 from 10.6.8.

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[Solved] How to fix default messy disk permissions?

Whenever I set up a new linux install, be it Fedora or Arch, I'm facing the same mess with the default mounting configuration. This time is no different. I gave up on it with one of my previous installs (Arch) but this time I'd like to tackle the problem and learn WHY this happens. I'd appreciate any help.
$ lsblk -f
NAME FSTYPE LABEL UUID MOUNTPOINT
sda
├─sda1 ext4 S_50 81013467-61c5-4fca-a8b1-6471ab2ff66e /run/media/hg1/S_50
├─sda2 ext4 S_140 ada1868a-eb43-40ac-87ba-8a99bb9800f6 /run/media/hg1/S_140
├─sda3 ext4 S_740 9ca4788c-b6ab-4f2e-aa10-b8167ae76d4c /run/media/hg1/S_740
└─sda4 ntfs S_10ntfs 457FAFD72A8942B7 /run/media/hg1/S_10ntfs
sdb
├─sdb1 ntfs 208A713C8A711010
├─sdb2 ntfs ss_win 0A80775A80774AE9
├─sdb3
├─sdb5 ext4 ss_boot ac72a869-6615-418c-8ded-0d332031cad5 /boot
├─sdb6 ext4 ss_var 916eb67e-b963-4781-b434-6ec3281bd1b1 /var
├─sdb7 ext4 ss_root 61c35767-58d5-44cd-9be0-de43e88c4b25 /
└─sdb8 ext4 ss_home 35390a6a-8220-4a90-9065-227bdfcb2946 /home
sdc
└─sdc1 ntfs 500_ntfs 7062D4863AD9B32D
sdd udf Parted Magic 2014_11_19 2014-11-19-06-59-19-00 /run/media/hg1/Parted Magic 2014_11_19
sr0
$ ls -l /mnt
total 8
drwxr-xr-x 2 root root 4096 Mar 25 20:45 sdb5
drwxr-xr-x 2 root root 4096 Mar 25 20:25 sdd
$ ls -l /run/media/hg1
total 18
dr-x------ 6 hg1 hg1 312 Nov 19 13:59 Parted Magic 2014_11_19
drwxrwxrwx 1 hg1 hg1 4096 Apr 18 20:58 S_10ntfs
drw-rw-rw- 3 hg1 hg1 4096 Apr 17 21:08 S_140
drw-rw-rw- 2 hg1 root 4096 Apr 17 21:08 S_50
drwxr-xr-x 14 hg1 root 4096 Apr 18 20:58 S_740
$ cat /etc/fstab
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sdc7
UUID=61c35767-58d5-44cd-9be0-de43e88c4b25 / ext4 rw,relatime,data=ordered 0 1
# /dev/sdc5
UUID=ac72a869-6615-418c-8ded-0d332031cad5 /boot ext4 rw,relatime,data=ordered 0 2
# /dev/sdc6
UUID=916eb67e-b963-4781-b434-6ec3281bd1b1 /var ext4 rw,relatime,data=ordered 0 2
# /dev/sdc8
UUID=35390a6a-8220-4a90-9065-227bdfcb2946 /home ext4 rw,relatime,data=ordered 0 2
$ mount | column -t | grep /dev/sd
/dev/sdb7 on / type ext4 (rw,relatime,data=ordered)
/dev/sdb6 on /var type ext4 (rw,relatime,data=ordered)
/dev/sdb5 on /boot type ext4 (rw,relatime,data=ordered)
/dev/sdb8 on /home type ext4 (rw,relatime,data=ordered)
/dev/sdd on /run/media/hg1/PartedM type udf (ro,nosuid,nodev,relatime,uid=1000,gid=1000,umask=77,iocharset=utf8,uhelper=udisks2)
/dev/sda3 on /run/media/hg1/S_740 type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2)
/dev/sda1 on /run/media/hg1/S_50 type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2)
/dev/sda2 on /run/media/hg1/S_140 type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2)
/dev/sda4 on /run/media/hg1/S_10ntfs type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096,uhelper=udisks2)
0. Could anyone tell me why the order of assigned letter codes is so weird? Does it even matter? External drive is sda and my main drive (SSD) is sdb. I always connect my drives to match drive importance vs motherboard disk channel number.
1. I'd like to start with the sda which is an external USB 3.0 HDD (Seagate BK+):
a) why by default I have read/write access to sda3 but not to sda1 and sda2?
b) how do I get read/write permissions to all partitions on sda persistently?
Last edited by bbarcher (2015-05-02 13:10:22)

bbarcher wrote:OK, so no fstab alteration required per se for now.
Right.
These two bits bring me to the question I wanted to ask since like 2 years ago: What's the difference between a mountpoint and a path?
A mountpoint is always a path, but not vice versa. A partition has to be accessible somehow and that is the unix way with a unified hierarchy. Windows differs insofar as by default every file system has a seperated one, starting with the drive letter - although in recent versions file systems can be mounted in directories as well.
A consequence of a path being a mountpoint, as you have already discovered, shows in that not every operation crosses file system boundaries - be it for technical reasons or to counter human stupidity.
For example, if you issue
chmod 777 /home/hg1
(or is it chmod -R ?)
the operation applies to every file, directory and sub-directory in /home/hg1
if you want it recursively, it has to be chmod -R. Otherwise chmod affects only the file/directory it is called on.
but it's different with mountpoints. Issuing
chmod 777 /mount
won't apply to to every file, directory and sub-directory in /mount including e.g. /mount/sda1/..., /mount/sda2/... etc.
Similarly issuing
rm -rf /home/hg1
won't remove everything down the line if there's for example sdb1 mounted to /home/hg1/mumbo/sdb1.
And that is probably for the best.
One more additional question:
computer 1, all files on an external disk with permissions restricted to computer 1 user by the name of theone
computer 2, has a user by the name theone as well
Q: Will theone from computer 2 be able to access the files on the external disk?
That depends. User and group IDs are stored numerically. If theone has the same ID on both systems, then yes.
Note: I use Parted Magic often. Everything I write there gets restricted to 'root'. I have no problem taking over such resources using chown on my regular linux installation. So what's the point?
Do you mean, since you can issue chmod/chown using e.g. sudo, it shouldn't be created with uid/gid root?
In that case, how else should it be? Since it's your machine, you had better be able to somehow become root. And, even if not, which user should be the owner, if not root? root is always a safe bet since every system has that user. Also, if it is a true multi-user-system it'd be a bad idea if you'd start a partition with any other permissions.

How do I restore a disk image on the startup disk?

Hello,
Where do I begin? Ok, my computer is an iMac and I mainly use OS 10.6.8. I have partitioned the disk into three parts: Snow Leopard, Lion and Tiger ( and I'm thinking of deleting Tiger). The main OS I use on my computer is Snow Leopard (10.6.8). I wanted to try out Yosemite so I upgraded the Lion partition and it soon became Yosemite. I was able to switch back and fort a couple of times last night, but today, when I went to the Startup Disk to go to Yosemite the disk image for Yosemite was gone and it only shows the disk image for Snow Leopard. I did a little research and if I'm not mistaken and read correctly, it indicates that Apple has done away with the disk image for Yosemite? How is one to switch back and forth between systems? Thank you for any insight to my question. -Della
P.S. If I have posted in the wrong category, please feel free to repost in the correct category, but please let me know. Thank you!

If it's a Windows executable file other than a self-extracting zip, you won't be able to open it without installing Windows; on a PowerPC Mac, this requires Virtual PC or the Q emulator.
If it's a self-extracting zip, StuffIt Expander will open it.
If it's actually a disk image, change its extension to dmg or iso and double-click it.
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Upgraded using Snow Leopard 10.6.3 & now running 10.6.8. How to repair Disk Permissions?

Is it true that running Disk Permission Repair from the original 10.6.3 Snow Leopard disk will not properly repair my hard drive curently running 10.6.8? If it is true, how can I properly repair disk permissions in 10.6.8 if it's counter-productive to boot from the 10.6.3 disk? My MBP is a September 2006 model.
Thanks, Thor

If you mean repair permissions, run it from the Mac OS X 10.6.8 system without rebooting.
If you mean repair disk, restart from the computer's original thumbdrive or Mac OS X install DVD, and if that doesn't work, with the Shift key held down to quietly run the repair utility.
(71911)

Verify Disk permissions procedures and time?

How often should one Verify Disk Permissions?
Should this be done through the iMac Applications/Utities/Disk Utility.app or should this be done using the Lepard Installation Disk?
When it starts, how long should it take? The last time I did this, it took 5 hours. Is this excessive?
Thanks
Message was edited by: Herschel Hochman

Oh, you were going by the estimated time - don't, it's usually wildly inaccurate.
As far as using an install disc for Permissions repair, here's what Apple (and I) say:
+Should I start up from a Mac OS X install disc to repair disk permissions?+
+When possible, disk permissions should be repaired while started up from a Mac OS X volume (hard disk) that contains updated Mac OS X software, instead of a Mac OS X installation disc. Mac OS X software updates may change permissions on some files to improve security. When this occurs, the version of Disk Utility on the Mac OS X volume is updated to account for the new permissions. Running Disk Utility while started from the Mac OS X volume ensures that the changes made by software updates are preserved.+
The entire article can been seen [here|http://docs.info.apple.com/article.html?artnum=25751].
The top drive is always followed by volumes it contains - e.g. my hard drive is WDCxxx, then under it and indented are the two volumes (partitions) I have on it.

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I need to restore my .sites file for iWeb from Time Machine, but when I try I get the following error:
"The operation can't be completed because you don't have permission to access some of the items." What IS restored are a few (10 or so) .jpg files that were part of my site that once contained thousands of pictures, dozens of movies, and three years of work. The file details inside Time Machine ("Quick View") is 972MB, but again -- what is actually restored is only about 10 pics of a mb each.
Does anyone know how to repair disk permissions for a file inside Time Machine? In Disk Utility the button to repair permissions is grayed out when I select Time Machine volume.
Much thanks in advance!

I have the same issue (and circumvented it by copying the files with "cp" from the unix shell). The permissions on the TM disk don't really look wrong, and the fact that I can copy the files means that they aren't read protected.
There seems to be some serious bug in Time Machine here, my guess is that the TM restore operation somehow does things in the wrong order (like copying with preserved access lists to a temporary location and then try to move the files from there. This won't work since the files will be protected with access lists from accidental removal on the TM disk).
More discussion in this thread:
http://discussions.apple.com/thread.jspa?threadID=2164188

I ran repair disk permissions an all my photos in aperture are gone. How can I get them back?

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If you've turned on "Find my iPhone" on the device you can track its location at iCloud. The device must be powered on and have internet access to be located.
Doubtful you ever backed up your "camera roll" to iCloud but you may have backed it up to your computer via iTunes. You can "restore" that backup to your new iOS device but you can't view the contents of that backup and pick out pieces of it.

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Hi,
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
Then Repair the backup Disk... any change?

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l just had my iMac hard disk replaced due a recall. Before taking it in I made a disk image with disk Utility and securely erased the disk. I also have Time Machine back-ups going back several months. On getting the machine back, since it contains sensitive data securely erased the new hard disk and started up with the Snow Leopard boot disk. When I tried to scan the disk for reinstall I get an error "Unable to scan 'image name' (internal error)". I tried several times with the same result. I then tried to restore from Time Machine and got a message that No Mac OS X backups were found."
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Rodocki wrote:
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How can I restore up to the current day after restoring from a disk image??

I do two types of backups... Every night I connect my MB to TM and it backs up changes made throughout the day. On Saturdays I do the same. I bring up time machine and force to backup NOW. I then turn off time machine. I then perform an image backup of the full disk and keep that full weekly image offsite.
Well I upgraded to SL, and once again many of my drivers still don't work with SL particularly a Verizon Broadband card that I was provided drivers for that have a bug. So back to Leopard I go again.
I restored the full image backup using boot from DVD & Disk utility. This worked fast and quickly restored my MBP to exactly the point where I forced the backup to time-machine. I had done some work Sunday morning, and made changes to a bunch of files. I forced a TM backup later that night to ensure to catch these changes. After the failure of the SL load, I restored as I noted from an image which is much faster.
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How do I restore my disk permissions?

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