[Video] mother Tries out amigaOS Workbench 1.1 (1985)

[Ral-Clan]

That sounds like WinUAE's emulated floppy sound.  You can adjust the volume to your preference but by default it's a little loud yet.
I actually like this feature of WinUAE, it really gives a feeling of working on an actual hardware Amiga.

[Ral-Clan]

AGREED!!!!  And it doesn't make that noise every time you click on something, only when you access the floppy...

Which was pretty much any time you did anything on an Amiga 1000 with WB1.1.

[Ral-Clan]

Did offices use an amiga 1000? How was the noise level?

Here in Canada the Amiga 1000 was well respected and even viewed with awe by many, but it never really caught on in a big way in business.  Sure, it may have been used in small-scale workplaces, and most videography businesses probably had one, but you wouldn't have found a floor of cubicles where everyone had an Amiga.  Remember, even by 1985 not everyone had a computer on their desk (although we were getting pretty close).

But as to your "how was the noise level" question.  Even in school computer labs where there were lots of Amigas, it wasn't a problem. Your settings in WinUAE / Amiga Forever make the drive sound a LOT louder than it was in real life.  You can turn the emulated drive sound down by pressing F12 while in Amiga Forever and going into "sound" and turning the drive sound down.

Now, dot matrix printers ---- those caused disruption!

[Ral-Clan]

You should have your mum play with GEOS on the C64.  A lot of people had a copy for their C64 back in the mid-1980s. In fact, I just read it was one of the best selling OS's of the 1980s.