I have a question that's easily answerable if I googled but live humans are a faster server/client model for I am short on time:
What do ALL bitcoins have in common that if you did a full search on the harddrive, you could find a bitcoin?
With this knowledge, you can detach the common info from the rest of the bitcoin and reinsert it when you need it. Without the common info, it would be impossible to perform a search for where your bitcoins are stored.