cannot mount encrypted disk

[hehe299792458]

I have an external hard drive that's encrypted with CoreStorage. When I plug it in, I get a prompt for my password. After I enter it, the screen freezes for 30 sec or so. Then the dialog box disappears, and my drive is still not mounted.

I try diskutil cs list in Terminal. It shows:

Logical Volume CDC1923E-FBD7-4CDA-B6B3-D3E0D1B6D997

---------------------------------------------------

Disk: disk3

Status: Online

Size (Total): 1999683715072 B (2.0 TB)

Conversion Progress: Complete

Revertible: Yes (unlock and decryption required)

LV Name: SamsungT3

Volume Name: SamsungT3

Content Hint: Apple_HFS

Then I try:
diskutil cs unlockVolume CDC1923E-FBD7-4CDA-B6B3-D3E0D1B6D997 -stdinpassphrase
And it tells me:

CDC1923E-FBD7-4CDA-B6B3-D3E0D1B6D997 is already unlocked and is attached as disk3

And then I try "diskutil list" in Terminal. It returns:

/dev/disk3 (external, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS SamsungT3 +2.0 TB disk3

Logical Volume on disk2s2

CDC1923E-FBD7-4CDA-B6B3-D3E0D1B6D997

Unlocked Encrypted

And yet I still dont see the disk in finder. Any ideas? I'm on macOS Sierra 10.12.6. Tried it both on a Macbook Air and a 2016 tMBP

 

[BrianBaughn]

Can you see it in Disk Utility...and try to mount it there?

 

[hehe299792458]

Can you see it in Disk Utility...and try to mount it there?

I see it in Disk Utility, but clicking "Mount" doesnt do anything

 

[Fishrrman]

Well, that's one of the problems of disk encryption. When it works, it's pretty good.
But when it doesn't -- one has problems.

That's why I eschew encryption, for the most part...

 

[hehe299792458]

Well, that's one of the problems of disk encryption. When it works, it's pretty good.
But when it doesn't -- one has problems.

That's why I eschew encryption, for the most part...

Yes... but there must be a solution somewhere

 

[BrianBaughn]

Likely won't work but next you could try the Terminal command to mount the drive.

 

[chrfr]

I see it in Disk Utility, but clicking "Mount" doesnt do anything

If you right click on the drive in Disk Utility, is there an option to unlock it?

 

[mjaminian]

I have solved the same problem as follow:

I was sorting/cleaning old disks. One of them was an encrypted USB external drive used as a full clone bootable backup for my main Mac notebook.

The main partition was greyed out in Disk Utility and I was unable to mount it.
I used DiskWarrior 5 (on MacOs 10.12.6) to scan it and it found lots of errors. After correcting them the drive mounted without any problem and became available in the Finder.

Disk Warrior is little bit obscure for many Mac user, but I cannot count how many times it helped me to recover a malfunctionning drive. It's a must have for any serious Mac user IMHO.