The process to make your own test rig is quite easy:
- Install OS X onto a USB hard drive. A partition with 20 GB should be just fine.
- Use the Startup Disk preference pane to reboot to that new OS and create an admin user.
- Install homebrew - https://brew.sh
- Install smartmontools -
brew install smartmontools
- Get a USB drive or SD card if you don't want to boot from the hard drive/partition.
- Thin out files if your image won't fit on the chosen media (or buy larger media)
- Use Disk Utility to Restore the OS from the partition to the media chosen
Now you have a UDB/SD card that can boot your Mac and run one of the best free SMART toolsrun one of the best free SMART tools.