Could this device:

http://eu-shop.elbox.com/cgibin/shop?info=510EX4

allow the addition of cabled hard drives and optical drives to our little Efikas?

It's intended (I think...) for the single 44 pin IDE interfaces of Amiga 1200 & 600s.

it's some amiga hardware, don't expect it to work on the efika.

No. Just give up on trying to add other kinds of drives to that interface.

The only reasonable solution would be to design and build a SATA adapter for it. Marvell make a reasonable bridge chip for it (88i8030). You could use two chips and get master and slave to SATA connectors right on a little screwed-down PCB.

Some enterprising developer could, should be able to engineer something like this in no time at all.

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Matt Sealey