My desktop PC is just now passing three years old. When it arrived I imaged the factory installed 2 TB hard drive, replacing it with a Crucial m4 256GB SSD for the boot volume. With a small registry tweak the 2 TB drive became home to the user profiles and related files.
The boot time of the computer was improved by the SSD. Since the boot volume was just the OS & apps it was quick & easy to backup by making an image of that volume. The fact that I make routine backups became important recently, when the SSD failed outright.
In this case I had just installed some updated to the OS, when a reboot was required. However, upon rebooting the system could not find the boot volume.