Access external drive over ssh on MacOS

Question

I have a new M1 iMac with a 4TB external (USB) drive attached. On the iMac I can access the contents of that drive, named "Data" at /Volumes/Data.

I use ssh to remotely access this iMac, and would like to be able to access the contents of /Volumes/Data. However, when I try I get "Operation not permitted".

I have gone into System Preferences, under Security & Privacy, and added Terminal, iTerm2, and bash (/opt/homebrew/bin/bash) to the list under Full Disk Access. This is mirrored automatically in Files and Folders. I've also added the same items to Developer Tools. All to no avail, I still get the "Operation not permitted" error when trying to do a cd or ls command against /Volumes/Data.

Some of my search results have suggested turning SIP off. I am reluctant to do this unless absolutely necessary.

I did try running chflags -R nouchg . in /Volumes/Data while on the iMac, but that also didn't resolve the issue.

Moving the external drive to a MacBook Pro (I.e., an Intel-based architecture) allows the contents of the external drive to be accessed remotely. The "Operation not permitted" error only happens when the external drive is attached to an M1-based Mac.

Is there a setting or preference that I've missed that will permit remote access to external hard drives on an M1-based Mac?

Answer 1

I'll put this here so there's an answer:

ssh-keygen-wrapper under "Full Disk Access" in the Security & Privacy pane needs to be checked (enabled) to allow remote access to external drives.