the dude asks about SSD cash for torrents and your multimillion-dollar answer is “raid”. lol

as people have already pointed out multiple times, what OP wants is something like mergerfs or unraid which can handle files on SSD cash and then move to spinning disks later.

wtf does raid have to do with anything here? yeah, sure, I’m the slow one.

or you could, you know, think about it for a second from their point of view. and they have already clarified this in other comments.

what is the point of faster download if you just have to do another entire copy after that?

but if the disk is actually bottlenecking at 40MB/s it will still take time to copy from the SSD. That plus the initial download to SSD will just end up being more time than downloading to the spinning disk at 40MB/s in the first place.

what OP wants is to download the file to a SSD, be able to use it on the SSD for a time, and then have the file moved to spinning disk later when they don’t need to wait for it.

this is just adding an extra step to the process before the file can be available to use. you’re just saving the copying to the HDD until the very end of the torrent.

can you copy files to it from another local disk?

agreed, I think there is something else going on here. test the write speed with another application, I doubt the drive actually maxes out at 40MB/s unless it’s severely fragmented or failing.

incidentally what OP wants is how most people set up Unraid servers. SSD cache takes incoming files for write speed, then at a later time the OS moves the files to the spinning disk array.