If we use MLC as the baseline, for a given density, a pSLC solution would cost 2 to 2.5X more and SLC would cost 4-5X the price. The problem is the relative cost of these solutions. As for estimating the lifetime, the Sandisk Product Manual states: SanDisk SD cards have an endurance specification for each sector of 100,000 writes typical (reading a logical sector is unlimited). The typical MLC based flash card is rated for 3000 P/E (Program/Erase) cycles, pSLC ranges from 20,000-60,000 and SLC is rated at 100,000. fsck is a commonly used Linux application and you can use it to check a partition like this: fsck /dev/sdx Where x is the partition number. For the purpose of this article we will focus only on MLC, pSLC and SLC. Flash cards today are available in 4 different technologies: TLC, MLC, pSLC and SLC. The question remains, how can the lifetime of a flash card be estimated for a given application? Matching the right flash card to the application ensures the system is not over engineered, leading to higher costs, or worst yet, under engineered, leading to failures in the field. ![]() Selecting the right flash technology for a givenapplication is key if cost and reliability goals are to be met. Flash cards are finding their way into many embedded designs.
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