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Eternal flash memory

11.12.2012

The new technology allows to increase the maximum number of rewrite cycles in flash memory from 10 thousand to 100 million. Scientists from the company Macronix, located in Taiwan's city of Hsinchu, have developed a technology that can save flash memory from the effect of aging.

The aging effect is one of the shortcomings of flash memory, which, along with other factors - primarily cost - prevents its mass distribution. The fact is that the constant exposure to high voltage cells wears them out, and over time they lose the ability to take on a clear logical state.

Modern flash memory loses its ability to reliably store information after 10 rewrite cycles. In the case of a USB stick, which is also based on flash memory, this does not matter due to the generally short lifespan. However, for SSD drives that laptops are equipped with, this is important, since the life of a computer can be several years. This indicator is even more important for corporate data storage systems with a high load.

With the goal of improving the viability of flash memory, scientists turned their attention to a type of memory based on the phase state of matter. In phase memory, a cell changes its conductivity when heated. The researchers found that similar heating of a cell in flash memory has a recovery effect.

Following this discovery, the scientists modified the conventional flash memory chip by adding tiny heaters for groups of cells. By heating the cells to 800°C for a few milliseconds, they were able to extend their life cycle. According to Macronix spokesman Hang-Ting Lue, under laboratory conditions, they were able to extend the life of flash memory up to 100 million write cycles. But the company claims that the theoretical limit could be as high as 1 billion cycles. Researchers have not yet had the opportunity to understand this limit, as testing will take several months.

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