Master Lu's hardware health information.

"Hard disk used *** 23 times" refers to the number of times you turn it on and off, because the hard disk head will be erased every time you turn it on.

"Cumulative 37 hours" refers to the cumulative * * * duration of 37 hours in the 23 times when the computer is turned on.

PS: It seems that illegal switching on and off is also a hard disk usage, and so is my illegal switching on and off several times.