Depending on the firmware settings it can get into anwrite protected mode so you dont loose your data. However you should get SMART warnings from the BIOS when it gets critical ar POST.
You can use Crystal Disk Info to monitor the healt status on most common SMART attributes.
I think most of the time before you reach the end of life on a SSD it will fail miserably before that.
Also most SSD have overprovosioning, a pool of reserved flash used when the controller starts detecting bad cells it will mark them as unusable if that’s the term and enable new cells to be used.
That’s why you see SSD advertised as 480GB and 500GB.
Look in the datasheet for TBW to get an idea of how much data can be written to the SSD.
For an average home user IIRC it is about 3 to 5 years.
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