"Modern SSD drives employ smart wear leveling techniques [3] that, instead of re-using existing blocks of memory, will write to a different block when data stored in a certain block is being modified."

Can this behavior be exploited to enable a hardware based file versioning system? For example, SSD explicitly exposes to OS, where new blocks are written and which blocks they are overwriting. This would allow FS to cheaply track multiple versions of files. When a portion of a file is overwritten with some new change, this version is discarded and SSD is instructed that rest of blocks that were storing changes for that version of the file are expendable as well. Depending on SSD capacity and usage, a simple algorithm of overwriting oldest block first, would provide several versions for each changed file virtually for free.