The drive does not know when data stored on the drive is “deleted”. This is what TRIM is for, i.e. when you delete a file you just unlink the inode. You need to

The drive does not know when data stored on the drive is “deleted”. This is what TRIM is for, i.e. when you delete a file you just unlink the inode. You need to tell the drive that the blocks that the file occupied are no longer needed, so the disk can ignore that data when reorganizing or later rewriting part of the block.