There are some circumstances when it is dropped, on some usb connected devices, or when the system is under stress, etc. However TRIM is a wave goodbye command, there is no check that it has been, or will be, carried out. But Recuva can still be used to examine live files etc.įor TRIM to be effective it must be available and enabled on both the device and O/S. It can't retrieve a deleted page and thus asking to overwrite an unmapped page is meaningless. If the file system sends a request to write to the unmapped page then a new page is assigned from the available page pool and the lba/pba addresses updated.

A page full of zeroes does not physically exist on SSD's. If the file system sends a request to read the unmapped page then a default page of zeroes is returned. This does two things:ġ) The pages are unmapped from the lba to pba addressing tableĢ) When garbage collection is invoked internally by the SSD controller these pages are emptied and assigned to the available page pool. As far as I know, the TRIM commend flags a particular page or pages as invalid.

Recuva android reddit