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write amplification

Tom LiAugust 9, 2017

Write amplification is an undesired phenomenon in SSDs when more writes to the NAND occurs than necessary. Due to most NAND having a limited number of write/erase cycles, high write amplification could significantly impact the lifespan of an SSD.

Write amplification could happen in a variety of ways, but the most common way it can occur is the way the SSD handles modifications to a specific block of data. Storage blocks are divided into pages, and pages within the SSD can’t be deleted individually. This means that whenever a few pages need to be altered, all the old data within the block needs to be erased and rewritten to include the modified data, wasting erase/write cycles in the process.

Write amplification can be mitigated with over-provisioning, TRIM, wear-leveling, and garbage collection.

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About The Author
Tom Li
Tom has a strong passion for computer hardware and technology. In his downtime, he enjoys gaming, playing guitar, and photography.