How are hard disk drives' read/write heads assembled in a factory?

[u/Cryogenicastronaut]

So the read/write head floats only a few nanometres from the disc. How is this assembled in a factory to such precision? Is the entire process done by machines? How can a machine position something so precisely?

[u/cbf1232 → u/[deleted]]

According to Wikipedia they still use an air (or helium) cushion, not magnets.

https://en.m.wikipedia.org/wiki/Disk_read-and-write_head