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Wear Leveling

Posted: 21 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:wear leveling? data storage? flash memory?

Today's embedded systems use flash devices in data storage applications that may emulate a hard drive disk (HDD); these types of erase/write intensive applications have highlighted concerns about flash product life expectancy. Flash memory devices are limited to a finite number of Program Erase (PE) cycles. An embedded system's product life expectancy is tied directly to the flash use model and the number of PE cycles guaranteed by the flash device. Using proper flash management tools, the flash life expectancy can be extended to the point where the erase/write cycle limit has no consequence in many write-intensive applications. A common technique used for extending the life expectancy of the flash memory is wear leveling. It is good practice to properly evaluate a systems flash use model and to determine if a tool like wear leveling can be used to extend flash life cycles to meet system requirements.

This application note will highlight a) what is wear leveling, b) advantages of using wear leveling and c) wear leveling mechanism.

View the PDF document for more information.

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