I think the larger problem is network bandwidth rather than hard device capacity. Even with high speed Internet connection (> 20 Mbit/sec) it can take a couple of days to download the block chain from scratch.
lol. You only have to download the chain one time - forever. People sit in their living room all over the planet streaming movies every night and you worry about 2MB every ten minutes? Clearly you failed your math A levels.
No you don't just download the chain and be done with it. A full node does not only download blocks - it also receives and relays unconfirmed transactions and sends out blocks to other SPV clients.
Your node could easily send out terabytes of data in 1 month if you don't restrict it.
This node has been up for only 6 days and has already sent out 144 GB.
