Why can't I repartition/format a hard drive having booted from it?

[rodion15]

If the OS is loaded into RAM during boot, why can't the system disk be repartitioned or formatted?

 

[cliffordcooley]

Because it is programmed to protect itself from accidental harm.

 

[DelJo63]

If the OS is loaded into RAM during boot, why can't the system disk be repartitioned or formatted?

That's a fallacious assumption. Almost every OS has a 'resident' portion, but lots of dynamic stuff that is loaded as-needed.
In windows, not just DLLs but also kernel stuff. In Mac, it's similar but a DLL is known as an *.SO (shared object)

 

[rodion15]

That's a fallacious assumption. Almost every OS has a 'resident' portion, but lots of dynamic stuff that is loaded as-needed.
In windows, not just DLLs but also kernel stuff. In Mac, it's similar but a DLL is known as an *.SO (shared object)

Okay, thanks for your answer