Garbage Collection is a mature SSD technology. Activated by an algorithm mechanism, it can separate and unify invalid data and valid data, erase invalid data together, and effectively improve the durability and performance of SSD.
NAND Flash cannot write new data by overwriting old invalid data. The original invalid data in the block must be erased before new data can be written. The Garbage Collection technology can merge the effective data in each block and erase it in units of blocks to maintain the use effectiveness of SSD.