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Phase Change Flash Memory is the Future

Phase Change Flash Memory is the Future

Phase Change: Cruchy on the outside, soft on the inside

IDF Spring 2007 This morning in sunny Beijing Intel's Chief Technology Officer, Justin Rattner, showed off one of the potential future solid state memory technologies: Phase Change.

Whilst the idea itself is not wholly new, we now have an update on where it fits given that Intel is looking heavily at Flash being the future of storage and cache. Typically a Solid State Disk (SSD) will use one tenth of the power and offer potentially 10x the performance with 1000x more durability (especially in mobile situations) when compared to traditional magnetic media.

Current generation flash technology is either NOR or NAND. NOR offers bit write and erase, but is entirely unsuitable for large I/O, although you can run applications from it natively. BIOS chips, for example, are built on NOR flash.

NAND acts more like a hard drive in that it offers block write and erase but it also allows a large I/O bandwidth making it very suitable for applications like Intel’s Turbo Memory. Both, however, suffer from a limited write cycle time, which particularly affects NAND as it offers the higher I/O.

The next generation will potentially use Phase Change Flash Memory technology which offers 1+ million write cycles and bit-erase like NOR, not block-erase like NAND. Being non-volatile it allows >10 years non-volatile secure storage, providing the interface doesn’t change in the meantime.

Phase change does exactly what it says on the tin, whereby depending on which phase it's in; it offers different electrical properties that can be read as a 0 or a 1. Changing phase means it converts the necessary chemical (likely a crystal) from a solid to a liquid or vice versa if it receives an electrical stimulus.

Phase change technology has even been touted to have the opportunity to replace traditional DRAM in the future, although nothing has yet been detailed.




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3 Comments

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Skill3d 17th April 2007, 17:37 Quote
looks very promising! can't wait for high cap flash mem. for laptops etc.
mmorgue 17th April 2007, 17:48 Quote
I certainly think it's promising and is definitely the way forward -- tho perhaps it will take a good amount of time (years) before it effectively does what DVD did to VHS.

Can't wait until things are virtually instantaneous -- i.e., flick a swicth and my OS is up and running... not 85 seconds later...
Bluephoenix 17th April 2007, 20:12 Quote
Looks very promising, though I remember reading in Scientific American a while back that the early prototypes of this type of memory were particularly vulnerable to hard physical shock (acceleration/deceleration/impact)
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