"Fast and reliable non-volatile memory of some sort that will replace flash memory
is the dream of more than a few semiconductor researchers and chip makers. And
boffins at IBM Research in Zurich, Switzerland, think they have come up with a new
encoding technique that will allow for multi-level cell (MLC) phase change memory
to be commercialized at some point in the not too distant future."
See:
http://www.theregister.co.uk/2011/06...change_memory/