What is C:\Windows\Prefetch

I see it in perfmon process required much Disk Read (B/min). Can I delete all the file in this folder?

Prefetch folder is used to speed up the loading of boot files.

Open registry editor (Win + R) regedit and navigate to this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters



Under this key you should see a value named: EnablePrefetcher

It has 4 values:

0 - Disabled : The prefetch system is turned off.

1 - Application : The prefetch only caches applications.

2 - Boot : The prefetch only caches boot system files.

3 - All : The prefetch caches boot, and application files.

Don't disable it. This will make the boot time longer.

Select the number 2 option