I'll start with the specs: CPU: i5 6500 MOBO: Gigabyte H170-HD3 RAM:16gb hyperx fury 2133mhz GPU: GTX 960 FTW 2gb PSU: seasonic 550w gold SSD: Sandisk ssd plus 240gb HDD: hitachi 1tb. So... my problems started last week when I was came back to my computer after having dinner and the monitor screen was black and read 'No operating system found, disconnect any drives without an os'(something like that anyway), so I turn off my pc and disconnect my hdd and leave my ssd plugged in, windows boots and everything is normal, turn off the system and connect my hdd back, everything fine still. A few days later I have a power cut which shuts down my pc and the day after the os isn't detected again, so i think that's weird, ill do what i did before and it should work again. It works again kinda... Now my PC is painfully slow and simple apps like chrome and settings are not responding, in task manager the disk usage is very high most of the time and I don't know why. Is my ssd corrupted/damaged? or has a windows update messed up performance? I should probably mention that all temps are fine at 25 degrees average.
What program do you recommend for checking ssd health? Any help is appreciated.