On the demountable drives -- ones where the user is
expected to
interchange the pack -- the heads can be replaced in a normal
workshop. The manuals warn you to keep things as clean as possible
(and certainly not to smoke :-)), but you don't need a clean room.
That reminds me of once, some 15-20 years ago, when I was working as a
sysadmin. I happened to wander into the machine room while the field
circus[%] tech was doing a PM on our (removable-pack) disk drives. He
had the drive open and the guts all hanging out - and smoking.
I fear I went rather ballistic; we didn't let people smoke in that
machine room even under normal operating circumstances.
To _make_ heads is another matter...
To be sure.
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[%] I don't usually like to use phrases like "field circus" (or
"salesdroid" or similar denigratory mutations), but in this case
I'm inclined to hold it warranted: the tech either had no idea what
he was doing or just didn't care, and either one is inappropriate
behaviour for a field service tech. (Not to mention disrespecting
the no-smoking signs all over the walls at his customer's site to
begin with.)