Windows 10: Should use usb expansion drives as system disks or not?

Yes, I know. That's the point. How to define it so's it is handleable?

There's two things I'm thinking of:

1. Which files/folders to get off a disk before putting a new windows install on top.

2. Which files/folders are going to increase in size and generally by how much so's we can monitor and allow for increase?

And my answers at the moment with my current very imperfect knowledge are:

1. My Documents.
2. Windows and Program Files. Size of average increase unknown.

 

I have two computers running Windows 10 just fine on 32GB installed eMMC memory. But they are only used as media clients and internet surfing. But - to answer your question - Microsoft says 16GB is required for 32-Bit Windows 10 and 20GB is required for 64-Bit Windows 10.

This is my desktop computer running Windows 10 Professional 64-bit on a 128GB SSD:

 

Logically, I'd create two partitions: one for user data, other for windows and program installs.

• It makes backups/recovery much simpler (a separate discussion)
• You can easily monitor and manage partition size and growth

You can easily resize partitions if need be or move them to a larger drive if needed. I think 40-60GB for the Windows safely sufficient (60GB is on the large size after installing many, many programs) User data for the rest

How to Move Users Profile Folder to another Location in Windows 10