[ale] OT: SSD vs spinning rust

[Steve Litt]

On Tue, 4 Nov 2025 18:08:21 -0800
Ron via Ale <ale at ale.org> wrote:

> Wayne via Ale wrote on 2025-11-03 10:00:
> 
> > SSDs (flash memory) are more susceptible to Bit-Rot, and more so
> > with the higher densities MLC, TLC, and QLC in order of increasing
> > density. Elevated temperatures, particular during storage,
> > exacerbate the problem.
> > 
> > Long term 'storage' is probably more reliable with a good quality
> > hard- drive. But hard-drives are physically more fragile, so not as
> > good with laptops in motion.  
> All true, but bit rot is a solved problem with:
> 
> ZFS mirroring on redundant disks.
> 
> 
> Since storage is generally cheap-ish, and data is invaluable, a
> mirror vdev in ZFS, which *detects* and *corrects* bit rot is the
> only way to go.
> 
> All the other features are just icing on the cake.

How much bit rot can ZFS correct? The more redundancy (typically parity
bits), the bigger errors it can correct.

SteveT

Steve Litt 
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