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Under Longevity :

Garbage Collection and TRIM

There is an inherent difference when writing and deleting files from an solid state drive compared to hard disk drives. SSDs write to pages, which make up blocks, but can only delete full blocks. Garbage Collection basically copies data still in use to a new block, and then deletes all data from the old one. With TRIM command the number of operations needed for Garbage Collection is kept to a minimum – meaning the SSD is not unnecessarily worn out.

Trimming Away Unneeded Data
It can get tricky when deleting files from SSDs. What TRIM does is instantaneously mark the files that you delete to be removed during the next Garbage Collection run. These files might otherwise have been shuffled around the SSD causing unnecessary wear.
What TRIM does is instantaneously mark the files that you delete to be removed during the next Garbage Collection run.
 
Fewer Cycles for a Longer Life
Strictly speaking TRIM is not a necessity, but it will always improve the Garbage Collection process. With the two technologies working together the lifespan of your storage device is drastically increased.
TRIM elongates SSD lifespan