San disk has find with a fairly creative small device, called the incorporated SSD or iSSD.

The iSSD is a solid express devices no larger than a postage stamp at 16mm x 20mm x 1.85mm, and weighs less than one gram. The total possible capability ranges anywhere from 4GB up to 64GB and can get speeds of up to 160MB/s read and 100MB/s write.

When the iSSD is proposed for portable device storage, in products like tablets and ultra-slim notebooks with its unbelievably small BGA form factor it isn’t excessive to require it could be seen on phone sized devices and with its size and speed it could well be able of running a total operating system.