Windows 10 pc has been playing up

when I start windows and it load you hear the sound of pluging something into the usb port when you look in my computer my spare hard drive is gone , there is also a popup from intel rapid storage tech say the drives been removed if I restart my pc to get the hard drive back it will either work for a while but once I try loading something off the hard drive it fails and disappears, then if I try to restart windows will go into automatic repair where it attempts to scan and fix this hard drive, it eventually dose only t have the hard drive disconnect again after start up, last night my pc was stuck in a loop where it said its crashed saying stop code system thread exception not handled and what failed ntfs.sys, it would then reboot only to try to repair then stop crash and repeat