Regedit is a Windows Registry Editor tool that allows you to view and edit the Windows Registry, which is a database of settings and options for the Windows operating system and installed programs. USB refers to a type of storage device that can be connected to a computer via a USB port.
When you insert a USB device into your computer, the device is assigned a unique device ID by the operating system. This device ID is stored in the Windows Registry, under the key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB. This registry key contains information about all USB devices that have been connected to the computer, including the device ID, vendor ID, product ID, and other details about the device.
On the other hand, USBSTOR is a key in the Windows Registry which contains information about USB storage devices that have been connected to the computer, such as USB flash drives and external hard drives. The key is located at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USBSTOR.
The difference between these two registry keys is that USBSTOR contains information about USB storage devices specifically, while the USB key contains information about all USB devices that have been connected to the computer, including non-storage devices like USB peripherals like keyboard, mouse, printer, etc.