I've got an old Iomega Home Cloud 2Tb nas which, according to their forums, can be mounted with Linux (The removed internal disk that is) though I'm not sure what file system is used as it's effectively been running from an embedded ARM system.
The forum says you can't mount the disk under Windows but you can using Linux so I'd expect to see your three "volumes" plus the OS partition. Don't really know more than that.
As an asides, my Iomega nas, now owned by Lenovo/EMC, advised a firmware upgrade to patch the Shellshock vulnerability. All went well except the disk could no longer be seen on the network.
Loads of people complaining - no way to downgrade. The forum reported that he Lenovo/EMC help desk were useless saying "Because your drive is out of warranty we can't help you"
Nice one! Which is why some guys were removing the drive to try and recover their data. Best/worst Catch 22 of a firmware upgrade I've ever come across!
---ooOoo---
The Iomega work round, for anyone who wants to know, was to power down the nas, unplug from the network, re-power up and wait for one minute after the boot started (white led starts flashing, so 50 flashes approx) then reconnect to the network. Back and visible! As it's a nas I don't power it down so it should be OK, it'll probably fail again if rebooted though.
Play Bonny!