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Thanks for this part, I feel like this was a crucial piece of information I was missing. Also explains my observations about TRIM not being as important as people claim it is, the firmware on modern flash storage seems more than capable of handling this without OS intervention.

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The GC in the device cleans up.

TRIM is useful, it gives the GC important information.

TRIM is not that important as long as the device is not full (less than 80%, generally speaking, but it is very easy to produce pathological cases that are way off in either direction). Once the device fills up above that it is crucial.

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