A potential replacement for Flash memory could be on sale within three years, with small start-up company Nanochip announcing a new device that will hold eight times as much data as flash memory, while having a cost per gigabyte of up to four times less.

A relatively small company that has received VC funds from Intel among others, Nanochip says it will come out with a device in 2010 that will hold eight times as much data as flash. Additionally, the device's cost per gigabyte will be two to four times as less, says company CEO, Gordon Knight.

Many solutions have been proposed for replacing flash -- phase change memory, spintronics, silicon nanocrystals -- and so far no clear winner has emerged. Phase change memory, which involves heating microscopic points on a CD-like media to record data, seems to be the current leader. It isn't perfect. No less than a luminary than Gordon Moore said it was just around the corner, in 1970.

Nanochip, in fact, until recently worked on phase change memory, admitted Knight. Heating up those microscopic points, though, has proven difficult. As a result, the company switched to a new type of device about a year ago.

Nanochip's upcoming product technically isn't a chip. It is three chips. The bottom layer consists of silicon. Tiny actuators, or arms, are created and stick out from the silicon. These actuators in turn record data onto an overhead media layer. The whole thing is then capped with another chip. So think of it as the club sandwich of futuristic memory solutions.

In a sense, it is similar to IBM's Millipede prototype, which has effectively been abandoned. With Millipede, tiny actuators heated up microscopic points on media.

Nanochip doesn't use heat. The actuators change the polarisation of a microscopic point. Thus, the company uses electronics rather than heat. This means that data recording will be more accurate and the chip will last longer, Knight says.

The company can also make its underlying silicon chip on fairly old 180-nanometre processes.

"We can use fully depreciated manufacturing lines," he said. "There is nothing high resolution about making these chips."

Knight provided these details during a presentation at the AlwaysOn Stanford Summit and a meeting.