I've never heard of "disk locking" except for proprietary software-based encryption schemes. In those schemes, the lock is not at the hardware level, it's at the disk device driver level, which is at a fairly high level in the software. The purpose isn't to lock the disk hardware per se, it's mainly intended to encrypt the data stored on the disk drive.
Perhaps there's some kind of low-level spec for locking disks that I haven't heard about, so I'm willing to be corrected on this, but...
When you put the disks into the empeg and
follow these instructions, you will be completely re-partitioning the drives from scratch. I'm guessing that any sort of software-based "lock" data will be casually erased by this procedure.
So I think if you just follow those instructions you will be fine. Give it a try and let us know how it goes.