How do you create three partitions on a hard disk in Linux?

To create three partitions on the hard drive, you can use either the fdisk or parted command to complete this operation. Below are the steps using the fdisk command:

1. Open the terminal and log into the Linux system with administrator privileges.
2. Use sudo fdisk /dev/sdX (replace X with the identifier of the hard drive, such as sda or sdb)
3. To use the ‘parted’ command on ‘/dev/sdX’ (if ‘fdisk’ is not installed on the system).
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6. Enter the partition number. Typically, the first partition is numbered 1, the second is 2, and so on.
7. Please enter the starting position of the partition. Press Enter to use the default starting sector.
8. Please input the end position of the partition. You can specify the size of the partition, for example +100M to create a partition of size 100MB. Alternatively, you can press Enter to use the remaining space on the hard drive to create the partition.
9. Repeat steps 4-7 to create two additional partitions.
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Please note that after creating partitions, you will need to use the mkfs command to format them in order to use them in the Linux system. Use the mkfs.ext4 command to format the ext4 file system, for example: sudo mkfs.ext4 /dev/sdX1 (X1 represents the identifier of the first partition). For other file systems, you can use the respective mkfs command.