I just bought from a friend an AirPort Extreme 3TB Time Capsule. It is A1470 module. I've made a complete check up and it is in a good condition and everything is working.
It is replacing an older AirPort Extreme 4th gen. A1354 that had an USB hub powered hub and two external USB Hard drives. Those hard drives mounted on my network as normal hard drives (not time capsule).
I tried to make the same thing on the new Airport, to have the 3TB Time Capsule and the other 2 HD, each one working independently, but I could not do it.
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Am I doing something wrong, or it can't be done?