If you've installed another SSD into your PlayStation 5, you can move your games onto that storage device to clean up space on your main SSD. Here's how.

Mac 911 How to move your Mac’s Photos library to an SSD for better performance If your Photos library is on a hard drive or Fusion drive, consider the low cost of a new SSD.

It could read the data just fine booting from another drive. Even a reinstall on the SSD didn't fix the broken booting. I had to repartition, then it worked just fine.