As long as the health of the HDD is 100% with no bad sectors there's no reason not to reuse it.
When you get your new hetzner server check it with smartctl, hdsentinel etc, if any show bad sectors or health other than 100% I am sure they'll be happy to replace it for you.
At work we have some Hetzner servers. About two times a disk broke; with RAID it was not a problem, a hassle, at least the first time, it was, yes.
Looking at the recycling issue I wonder if you are using so many disks (that fail) if it is possible to ship them to a low wage (sorry) country have them taken apart and rebuilt using parts from other disks where different parts failed?
You are (from my 10+ year experience with Hetzner at least).
:)
i ve also had some disk problems 5+ years ago, but not recently, even with the cheap bidding servers. Nothing that wasn't justified by their way-cheaper-than-others prices
I had a production server with two HDDs in some form of redundant raid configuration and both died at the same time. You somewhat lose the benefits of both drives mirroring the same data if both fail!
At one of my previous workplaces, we had a park of around 3k servers, with 2k of them on Hetzner. At such scale, you can not physically escape from the fact that all kinds of weird stuff happens with hardware, like buggy raid cards, physically unrebootable servers, dead cores, faulty and fake memory, bitrot, throttling due to underpowered PSUs,etc.
My favourite find was a "xeon 2637v3" with 6 cores (2 extra cores for free! unlike the normal sku.)
And we always had argument about their service, availability, giving us three faulty raid cards in a row, sued them few times for a refund, but... the company still liked them sooo much.
Also I wasn't really complaining I'd like to think - I was just stating facts. I saw like 10 "this is so awesome" replies here, am I not allowed to say I've not been a happy customer?
Many years ago: HDDs died like I've never seen it before, one every few months with just a couple of servers.
ca. late 2013: We had some production systems running on Hetzner hardware, we regularly! called their support to tell them the DC lost connection because our monitoring apparently was better than theirs and they acted surprised for not hearing something yet.
Only like 2-3 years ago: Got a new server, had SMART issues and had to have the disk replaced before the first 24h after ordering were up.
An ex-coworker of mine joked they must have added the "please change the disk" option in the support form just for him because he was running 20+ servers and actually had to call them every week to replace a dying disk.
Yes, this was all years ago - but I'd rather pay servers out of my own pocket than be oncall for production servers there, ever again.