From a back of the envelope calculation - given a 10,000 write cycle budget for 16 GB of flash memory and a 512 KB block size (all worst case scenarios), you ar

From a back of the envelope calculation - given a 10,000 write cycle budget for 16 GB of flash memory and a 512 KB block size (all worst case scenarios), you are looking at 300 million writes before the flash memory starts to fail. I probably unlock my phone 50 times a day (incurring 100 writes under my scheme), and that is negligible in the grand scheme of things.