1. You need to put the spare drive in a windows machine, use diskPart and clean the disk.   2. Use a new USB stick, download the old boot loader and DSM version that was originally on your NAS and write that to your USB drive. 3. Remove all the SATA cables from your DSM box for all the hard drives in it. 4. Plug in your spare clean drive and verify the SATA cable used is physically attached to PORT1 on your motherboard. 5. Plug in the new usb stick with the old boot loader an