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My external hard drive is partitioned into three parts - but somehow I made one of the parts go away/stop showing up in the Finder. I ran a set of recommended commands in terminal, and this is what I came up with:

Terminal view:

"Rachel Reboot Backup" is the one that I'm trying to get to show up again in Finder/be restored. Any advice? Disk Utility says it is mounted, and it doesn't appear to be marked hidden. I'm not sure what I did to it.

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  • Do you see your partition in Disk Utility? Commented Mar 16, 2015 at 15:42
  • I do. Even ran "verify disk" and it said "the volume appears to be okay."
    – Rachel
    Commented Mar 16, 2015 at 15:45
  • Can you cd into RachelReboot Backup? This partition is owned by root, not by you like the other 2. Commented Mar 16, 2015 at 15:53
  • How would I try to do that? sorry, I'm a little computer illiterate. But I'm a quick learner :)
    – Rachel
    Commented Mar 16, 2015 at 15:57
  • By executing this command: cd /Volumes/RachelReboot* (there is an asterisk in the end of the command) Commented Mar 16, 2015 at 16:04

2 Answers 2

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Onyx offers the option of hiding and revealing files, folders and volumes. You'll want to select the Utilities section and then Visibility. This may help with your visibility issue. If you can regain visibility you should be able to select the mounted volume and bring up its info (command + i), then tick the "Ignore ownership on this volume" box.

You could also try logging in as Root and see if that gives you visibility of your missing partition.

Really important bit first, as Root user you have the power to delete files that are hidden/protected under normal circumstances - be careful before deleting or moving anything as you could render your system unusable.

With that out of the way, you enable Root account access by using Directory Utility. This can be found in System/Library/CoreServices or System/Library/CoreServices/Applications, depending on your OS.

First you need to "Click the lock to make changes". Then, from the Edit menu, select "Enable Root User". You will be prompted to create a password for the Root account. Once that's done you can log out of your own account.

Now, log in with the username Root and the password you've just created.

Remember, as Root user you now have the ability to break everything if you're careless - so take your time, do what you need to do and then log out as soon as you're done

You should be able to see straight away whether you have visibility of your errant partition. Hopefully you do. If so, see if you get the option on the info page (command + i) to "Ignore ownership on this volume". If it does, tick it. If not, you could then try hvtuananh's suggestion of changing ownership with the command sudo chown RachelNicholsIII:staff /Volumes/RachelReboot Backup.

If any of that helps then logout and back into your usual account, then disable the Root account using the option in Directory Utility as previously outlined.

Once more, be careful what you do when logged in as Root!

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    Okay, downloaded Onyx and ran visibility in Utilities. It has no problem finding the drive and seems to run the process...but when the finder opens, it's still not there. Grr. From the terminal commands, it does seem like ROOT is now the owner of the drive instead of me - is that the problem? If so, any thoughts on how do I fix it?
    – Rachel
    Commented Mar 16, 2015 at 16:48
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Backslash escape character is needed when typing the Volume name (which contains a space) in the terminal. I mean that your disk is called

"RachelReboot Backup"  

So we need a \ before the space in the middle of the name.

Open your terminal and type:

sudo chown -R `whoami` /Volumes/RachelReboot\ Backup

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