Full definition
On SSDs, NAND cells must be erased before receiving new data (logical write is a 'write then erase' operation). Without TRIM, the SSD does not know which blocks are actually free, degrading performance and wear. With TRIM, the operating system (Windows, Linux, macOS) proactively tells the SSD it can erase cells matching user-deleted files. TRIM has a critical side effect in recovery: files deleted on TRIM-enabled SSDs physically disappear in minutes or hours, making deleted-file recovery virtually impossible on SSD. Backup is the only real protection on SSD.
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