Wow they all cost a fair bit, but that's fair enough.
I wonder if there's one I can parallel with a drive, such that the drive makes the right noises, but the actual code loads off an sdcard.
I'm tempted to just build one myself.
There's a fair bit of code online about this.
What would be cool is if it could connect to home network via WIFI and you could go to a page on a tablet and select the disks you want to insert.