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Wear leveling, garbage collection and trim are three technologies used to extend the life of flash memory devices and related products like solid state disk (ssd) drives. wear leveling magnetic storage media has an indefinite working life because the platter coating does not wear and the read write heads never contact the media. In the next post we’ll look at garbage collection some more, in particular the concept of background versus foreground garbage collection, as well as cover the infamous write cliff. but for now, just remember: no matter what form of flash you are using, in order for it to work and perform properly, something somewhere has to take out the trash…. Garbage collection copies in use data to a new block, and then deletes all data from the old one. why garbage collection? flash based storage devices are different from traditional hard disk drives where new data typically over write old data in place at the same physical location. New method of ssd garbage collection can boost drive performance up to 300% deletes data off a flash drive, that information may be scattered across multiple pages in a single block or across. Garbage collection (gc) is a fundamental process with all solid state drives (ssds), but it can be implemented in different ways that can impact the overall ssd performance and endurance. in this article, we’ll look at how gc works, how it can be implemented, and how it relates to the trim command and over provisioning.
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The garbage collection process and strategies are programmed in the ssd controller firmware and differ amongst drive manufacturers. drives that employ an efficient garbage collection process display good performance out of the box but also months later whereas drives that don’t, tend to slow down over time. The process of garbage collection involves reading and rewriting data to the flash memory. this means that a new write from the host will first require a read of the whole block, a write of the parts of the block which still include valid data, and then a write of the new data. Garbage collection and write amplification. unlike a hard disk drive, ssds have no mechanical parts and therefore read, write, and erase data differently. a flash cell is made up of pages, and several pages make up a block. data is written on a page level, but erasing data is done on the block level.
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Memory Allocation, Video 5: Garbage Collection