All is not well in the Samsung SSD camp, especially where servers, *nix and EXT4 meet: https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/
TL;DR
Broken SSDs:
SAMSUNG MZ7WD480HCGM-00003
SAMSUNG MZ7GE480HMHP-00003
SAMSUNG MZ7GE240HMGR-00003
Samsung SSD 840 PRO Series
recently blacklisted for 8-series blacklist
Samsung SSD 850 PRO 512GB
recently blacklisted as 850 Pro and later in 8-series blacklist