Amazing little devices for the price so are you talking about the block files being on the network (LAN)
or coming from a USB disk drive attached to the device ?

200gb from RJ45 would be slow and even USB3 D-Drive (thinks they do USB3) would be slow
so are you talking about plunging a SETA drive into a Raspberry here ?

Reading back down the BC for a current transaction to check all part coins history making up
the wallet without a major large index in memory would involve reading near 200gb of block files
so hats off to anyone that gets a full node working on one of these $40 devices.