SSD Lifespan

SSD lifespan is finite. However for all intents and purposes, they are more than enough for the home PC user. From a few reviews and tests, it has been found that at the lower end, if will cater for over 500TB of written data. The key indicator is Program / Erase.

A few links below explain in more detail.

http://www.pcworld.com/article/2043634/how-to-stretch-the-life-of-your-ssd-storage.html

http://lifehacker.com/5802838/how-to-maximize-the-life-of-your-ssd

http://www.tomshardware.com/forum/283327-32-life-span

http://www.pcworld.com/article/2856052/grueling-endurance-test-blows-away-ssd-durability-fears.html

https://techreport.com/review/24841/introducing-the-ssd-endurance-experiment/5

http://ssdendurancetest.com/

This article has some advice on Securely Erasing SSD

https://www.makeuseof.com/tag/securely-erase-ssd-without-destroying/