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I have a 2011 MacBook Pro Intel running Mountain Lion. I have a 2tb Seagate External Drive with 3 partitions: all three were set up the same way with different passwords as a person who used to live here was burning DVD's from my digital backups I felt the need to do so. I was having no issues with this for the first six months I had the drive set up like this but about two months ago this changed. I can no longer mount one of the partitions. It will not accept the password I KNOW goes to it. All I can figure is that, some how, the system encryption key must have been damaged. The only other pieces of Info I can give you is this. First, I didn't use firevault for this but Disk Utl. Second, at times, I can mount one of the other drives and even though I get the "shaking window" as though I typed in the wrong pw it still mounts the drive. Odd.

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Same problem here. Read and on and I'll tell you what I did to solve this problem:

I do Time Machine to an encrypted external Hard Disk. I stored the password to the disk in the default Keychain, and the system mounted the disk automatically after plugging it in. But suddenly, last morning, after I plugged in the disk, it prompted me for a password (it never did, since it was set to remember the password). In that dialogue, type a wrong password and the dialog does the wrong-password, shake animation, and it prompts for a password again; but type the correct password and the dialog freezes, like this: stops responding

The solution I have found to work is as follows:

  1. Launch Disk Utility and Select the Drive that won't unlock.
  2. Click on Verify Disk (after it finished it told me the disk needed repair), and after it finishes with the verification, click Repair Disk.
  3. I let the computer do it's job, and after a while (about 30 min), it told me the disk couldn't be repaired, but the disk was now mounted, and working normally. Like shown in the following screenshot:

And now, my Time Machine drive works normally again: Time Machine icon indicating a backup is in progress

So, launch Disk Utility, then Verify and Repair your faulty disk as needed. This worked in my case.

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You've posted this as an answer, which is only for things that directly answer the question asked. If you have a different question, feel free to ask it using the Ask Question button at the top right. –  bmike Sep 14 '13 at 23:28
    
Mike, I've updated my post detailing with the solution that worked for me. –  Andrés Segovia Sep 16 '13 at 0:12
    
Well done - I appreciate the detail. Thanks! –  bmike Sep 16 '13 at 2:25
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