There well may be hardware issues, but with ext4 it rarely corrupts the entire file system. You might end up with some data not flushed so you'll have some inodes that don't point to anything that you'll remove with fsck upon boot, but btrfs, I've had it corrupt and lose the entire file system. I've used ext2-through-ext4 for as long as they've existed and never lost a file system though back in the ext2 days I had to hand repair them a few times, but ext2 was sufficiently simple that that was not difficult, but within two weeks of turning up a btrfs file system it shit itself in ways I could not recover anything, the entire file system was lost. If I did not have backups, which of course I always do, I would have been completely fuxored. It is my opinion that btrfs and xfs, both of which have advantages, are also both not sufficiently stable for production use.