Unable to encrypt removable hard drive I have removable hard drive which I can't encrypt.

I'm following official guide, but there is simply no encryption option in the erase menu:


There should also be an option called "Mac OS Extended (Journaled, Encrypted)", but it is not in the list.

To be more specific I'm running the latest update of OS X High Sierra (10.13.1). The hard drive model is: Transcend StoreJet 25M3 2TB TS2TSJ25M3E.
The issue was with GPT partition. Somehow the disk didn't have it.

After running the next command:

diskutil partitionDisk /dev/disk2 GPT JHFS+ New 0b


disk utility started offering needed encryption options.

/dev/disk2 is the path of removable hard drive.

If you are not sure what is the path, run diskutil list - that will list all the disks and you'll be bale to pick yours.