[PhantomGremlin]

Are those 8TB and 10TB the helium ones with HAMR? Very slow.

My understanding of HAMR is that it is probably perfectly fine for Backblaze's backup products, which are (more or less) write-once, read-rarely. Shingled magnetic recording should also be OK for that use case.

But clearly not good for cloud storage.

[ck2]

Heat assisted is fine for write once but helium filled drives actually leak over time and fail because their molecules are so small.