The present invention provides a method of establishing a hard disk physical partition. First of all, it selects a sector in which the head of the hard disk physical partition is located, and establishes a user available partition of the hard disk within the range of the hard disk physical volume from the sector, the other portion of the hard disk becomes a protected partition of the hard disk, finally constitutes one hard disk physical partition. After entering into the hard disk physical partition, only the user available partition can be accessed, the protected partition is invisible to the user. It can establish the different hard disk physical partition in the different position of the hard disk through selecting the sector where the head of the hard disk is located. The present method can realize that protecting the various users' data from each other in physical on the premise of sharing the same hard disk, thus establishes fully separate data storage space from physical level, causes the user to have a proprietary run environment.