Cannot repair or erase external hard drive

I noticed in the diskutil cs list you have encryption enabled. You may need to first turn off encryption. You can do this in Disk Utility.app easier then running commands. Then try the diskutil coreStorage delete command again.

Is the one that seems to be working the same partition as the user you are logged in as? I'm guessing your computer has two login accounts. Each user has their own partition for time machine?

You can simply open Disk Utility.app, select the partition, and choose File -> Turn Off Encryption

It wouldn't show up there. It's going to occur in the background. You can check the status by running

diskutil cs list

and you should see

Conversion Status:       Converting

Once its done. Run the command to delete that volume.

diskutil CoreStorage delete STRING_OF_CHARACTERS

Then report back upon success or failure. And we can go from there on getting everything back to working normal 🙂

At least we're making progress.

To answer your first post:

You have two separate user accounts. Each user account was using Time Machine (encrypted) on its own partition. Time Machine encrypted that partition for the user for you.

Your user account only saw one partition mounted because the other partition was encrypted for the other user. To be able to see both partitions on the same user account, you would first need to 'unlock' the other partition. You would need to know the encryption key (password) that the other user entered.

Hope that gives you an understanding of what occured.

I answered your first post, after getting a better understanding of your setup. Knowing more earlier would've avoided a lot of steps, but at least your issue was resolved.

Glad its working out for you1

Hi mhadjar, I´m from Chile... I need your help pls !!

Following these steps helped me:

http://apple.stackexchange.com/questions/136590/how-can-i-delete-a-partition-cor estorage-logical-volume-from-the-termina…

Good luck!

😎