>>4238080
>SSD storage I just got as a Scratch disk; trying to make PS run better
Depends on the amount of RAM you have. If you have low RAM, or if/when Photoshop runs out of RAM, Photoshop will cache everything to the disk. This is where Photoshop is faster on an SSD compared to an HDD. Though, more RAM would be helpful(and cheaper) than an SSD, so I'd recommend getting more RAM unless you use a ton of layers with large pixel dimensions.
But you already got an SSD, so; it's going be faster than the HDD was but only when you run out of RAM. That said, the CPU and the GPU(supplementary if you use hardware acceleration) are the main factors in performance.
Also, you can check if you are actually using the cache drive(i.e, if you're actually benefiting from your SSD at all) in the efficiency indicator(pic related)
>Will the Files be deleted if I use the SSD as a scratch disk?
No, you'll run out of space and Photoshop will complain when you run out of both allocated RAM and drive space.