That way when the file has more data added to it, it should now be in a block with room to grow. With TRIM, the SSD would gather up the valid pages, write them to a fresh block, then erase the previous block. Without TRIM, when a block has mostly invalid data, is full, and someone wants to write to a file in that block but needs a new page, the SSD would first have to erase the block the write the data back to it. Flash memory cannot re-use pages unless they're erased first, but erases happen at the block level. It helps to know that flash memory is divided up into blocks, which contain a number of 4KB pages. TRIM is a command used to help the SSD know which chunks of data inside are no longer valid. So while keeping files in a continuous block of data is still ideal for SSD performance due to the way solid state memory is still addressed, the amount of writes don't make it a worthy tradeoff Defragmentation isn't useful on SSDs because they can access data in a random fashion much more quickly than a hard drive and it requires a lot of writing. The reason to do this was to improve hard drive performance so the data pick-up head doesn't have to move around all over the place. Defragmentation is rearranging files so that all these chunks in one spot.

But if the file can't fit in the block, it gets split up and saved in the next available space. Sometimes, depending on the file system and OS, new files are written in these free blocks. When you delete files, the space those files occupied are marked as free. When you write files on a fresh storage drive, the files are written as a continuous block of data (well, in 4 KB chunks). Click to expand.Short answer: TRIM improves life span.

Ssd defrag windows 10