What's the matter with the unknown partition in the computer disk manager?

Question: I checked disk management today and saw a partition called IBM_SERVICE. What is the use of this partition? It takes up a full 3.44GB of my space. My computer is the company's Lenovo brand machine, and the hard disk is only 40GB. If it is of no use, how can I make use of this partition space? Answer: This is the OEM partition of the computer. It saves some information of the machine when it was shipped from the factory. It is mainly the one-click restore backup of the original machine. You can delete it to free up space, but this will destroy the one-click restore function that comes with the machine. You can display this partition manually. Click "Start→Accessories→Command Line Prompt" and enter in sequence: diskpart sel dis 0 lis par. Take a look at the partition number of this OEM partition, for example, 3 sel par 3 set id 7. This will be displayed. If it still doesn't work, , then enter assign letter P, P is the drive letter, set this drive as P drive, and then you can format it. Of course, you can also hide it, the command line is as follows. sel dis 0 sel par 3 remove set id 27