Windows automatically mount a removable disk like Usb drive, hard drive, And All external drive’s Once mount a drive user can read and write execute to the drive. Although USBs are help you to transfer files between devices.
For example, any other person who can access your computer can copy your personal files from your computer via a USB drive. Similarly, anyone with the wrong intention can easily install portable tools on your computer like keyloggers, spyware, etc so it’s best to block removable disk
How to block removable disk in windows
Computer Configuration > Administrative Templates > System > Removable Storage Access
Now on the right-side panel, search for the option ‘All Removable Storage Classes: Deny all access.’
Now Double click on the file and select the ‘Enabled’ option.
Once done above process click on the ‘Apply’ button and then on ‘Ok.