Subspace is not behaving the same way Chia does when it comes to SSD writes, quite the opposite actually.
Chia derives special proof of space tables during plotting. Ideally, you’d use RAM for them, but since it is A LOT of RAM that is required, many farmers used SSDs as a replacement for that, which meant a lot of writes were done to SSD, eventually destroying them in some cases.
Subspace does use Chia proof of space as an internal component, but for a different purpose. Due to smaller value of K (17 on Gemini 3f and 20 on upcoming network it fits in RAM completely. For context Chia uses 32 and even increase by 1 approximately doubles the amount of space/RAM required.
Plotting in Subspace happens in sectors, each sector ~1G in size. Sectors are built in-memory and then written to disk as a whole. So instead of many random reads/writes/overrides, plotting is just writing sequential sectors, 1G at a time one after another. Like if you have copied a big movie filling the whole disk start to end.
Once plotting is done there is replotting that kicks in periodically, it’ll override select sectors with new sectors after expiration. In this case it is the same deal: old 1G sector is overridden sequentially with new 1G sector. ~50% of sectors expire every time history doubles, which means it both happens infrequently and less frequently over time as blockchain history increases.
So as far as farmer is concerned there is minimal write amplification due to the write approach and not as many writes generally as in Chia due to completely different protocol.
Eventually during duration of any individual network you’ll override the whole plot a few times, which even on the worst SSDs with low endurance (like 1000 overrides during lifetime) should not cause any issues whatsoever. Moreover, this is happening in SSD-friendly way, where random big sectors are overridden and not the same ones over and over again, which helps SSD to balance wear of cells well over time.
And farming is just random reads, which SSDs are very well optimized for.
I’d say Subspace farming is designed to be very friendly and gentle with SSDs, if you observe different behavior in practice, let as us know because it must be a bug somewhere.