acosmichippo , 10 hours ago (edited 10 hours ago)

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.