"In today’s solid state drives, the NAND flash memory must be erased before it can store new data. In other words, data cannot be overwritten directly as it is in a hard disk drive. Instead, SSDs use a process called garbage collection (GC) to reclaim the space taken by previously stored data. This means that write demands are heavier on SSDs than HDDs when storing the same information."
Read the entire article from TechSpot: Understanding SSDs: Why SSDs hate write amplification
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