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I have a 3 Terabyte hard drive I took out of an old NAS. I ended up using it as a distro testing drive, as it was old and I didn't want to risk losing data to drive failure. I installed Pop!_OS with full disk encryption, but ended up using a folder on it for backups.

I did a large file transfer last night and unmounted the drive. I connected it this morning and tried to open the encryption but got an error: "Could not mount /dev/sdd4. File exists."

I am using Ubuntu Studio 22.04 LTS.

tacodogg
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  • What is the filesystem on which Ubuntu Studio 22.04 LTS is running (the root partition /) and the filesystem on the 3 TB hard disk? – Raffa May 25 '23 at 10:12
  • Ubuntu Studio is running on ext4, with a seperate home partition that is also ext4. The 3TB drive is LVM2 pv. – tacodogg May 25 '23 at 13:48

1 Answers1

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I used cryptsetup to open the encryption on the hard drive, tried to mount, and got an unknown filesystem type error. Then I followed the instructions here. Thanks to @nork for the detailed answer!

tacodogg
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