One of my internal drives (the one for my user account data) is incredible slow. I reinstalled the OS on the system drive (SSD), so can browse all the internal drives freely with a new admin account. It takes 10 seconds from clicking a folder on this (SATA) drive to its contents appearing. Disk repair sometimes crashes when I try to repair this disk. At other times, it reports no problem. The system report doesn't report any issues with this HDD or bay. Is the disk dying? I am fully backed up (on another internal and a NAS), and my last TM backup was 3 days ago, so there will be no significant data loss.