Way off topic, sorry, just couldn't resist.
In fact not off-topic at all, because this technology
existed nearly 40 years ago.
News from our fellow IT industry workers in
Russia: The chinese have invented a disk drive
that allows you to write an infinite amount of
data to it! Discovered by a Russian engineer. Be
sure to click the 2nd picture for a close-up look
at this amazing new technology.
http://blog.jitbit.com/2011/04/chinese-magic-drive.html
The Chinese are way way late to this invention.
Signetics had this area perfectly well covered in 1974
with the 25120 Fully Encoded, 9046xN, Random Access
Write-Only-Memory.
It was such an achievement that you can even read about
it in Bob Pease's part of the NatSemi website:
http://www.national.com/rap/Story/WOMorigin.html
Tim.