Cheaper laptop, what replacement HDD would fit?

I'm looking for a laptop Asus X540SA a replacement HDD (500GB, HDD (not SSD)).
I find here no manufacturer information or similar to the model, which HDD is installed.
The only thing I found on the laptop is the name: HGST HTS545050A7E680. Can someone tell me which 500GB HDD would fit? ~ 5000UPM during i.O.

Installed is this:

https://www.mindfactory.de/...24532.html

Fit does then a 2.5 inch HDD:

https://www.mindfactory.de/...+HDDs.html

Nevertheless, an SSD is not much more expensive:

https://www.mindfactory.de/...74638.html

https://www.mindfactory.de/...59613.html

Under Windows 10 it should be one, if one does not stand on a super slow system.