In our Nexus 7 (2013) review, I talked about how I had confirmed that Android 4.3 onboard the device had enabled support for fstrim, an application which TRIMs blocks not in used by the filesystem. TRIM is essentially the paging channel through which the OS tells an SSD or eMMC controller that a block is no longer in use, and thus ready for garbage collection. This is critical for maintaining performance on the controllers in use across smartphones and tablets and preventing aging-related I/O performance slowdown.
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