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#1
Hi, roughly 20Gb normally for Windows. Allow 20Gb for Windows.old.
After that
- if you install programs on C: then however much your programs require
- + their working space in Documents, Videos etc and other folders
- If you store your personal data on C: in Documents, Videos... (which is NOT recommended), then however much that requires.
These last 3 can potentially be >> Windows.
And you need to allow empty working space- say another 20Gb
Windows 10 also creates 2 other partitions - Recovery (450Mb) and EFI (100Mb)
Example: I add minimally to folders in C: - my programs and personal data are elsewhere.
Win 10 is quite happy with 75Gb on my 256Gb SSD and System Restore is on.
Minimal compressed installations are possible.
dalchina thanks for the information. I do not save any documents or files of any kind on the C drive. I need to look at installed programs to check I am not running unnecessary programs. I use Windows Defender and it uses a lot of space. Georgz
Pretty much what the other poster said, so I'm not sure why yours is showing 133GB if you only have the OS installed on the C: drive.
Go to Settings > System > Storage > This PC (C: ) and it will give you a breakdown of Storage Usage, which may give you a better idea on how the 133GB is broken down.
You can also click each section individually, for example below is just the System & Reserved section on its own.