Comment by kalleboo

> HDDs typically have a BER (Bit Error Rate) of 1 in 1015, meaning some incorrect data can be expected around every 100 TiB read. That used to be a lot, but now that is only 3 or 4 full drive reads on modern large-scale drives

I remember this argument way back 16 years ago when the "Why RAID 5 stops working in 2009" article[0] blew up. It's BS. Those aren't the actual average error rates. Those are inflated error rates below which the manufacturer does not want to bother supplying a warranty for.

I have a pool with 260 TB worth of 10/14 TB disks in it 80% full, with monthly scrubs going back years. Not a single checksum error, and in total something like 30 reallocated sectors seen in SMART (half of those on a 7 year old drive).

[0] https://www.zdnet.com/article/why-raid-5-stops-working-in-20...