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[TERM] TRIM See definition [DEFINITION] 
A computer command used by a SSD to inform it of data blocks in the SSD memory space that are no longer in use. This command allows the SSD controller to reorganize the memory space it is managing to allow any unused space to be optimally relocated. The TRIM command is intended to become part of the AT Attachment interface standard.
SSD Glossary | StorageReview.com - Storage Reviews
DEFINITION