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Using fdisk to Create Disk Partitions
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The fdisk utility is used from the command line to create or delete partitions at the shell prompt To use fdisk to create a new partition, first open a terminal session Then, at the shell prompt, change to your root account by entering su followed by your root user s password At the shell prompt, enter fdisk device For example, if you wanted to create a partition on the third SCSI hard disk in your system, you would enter fdisk /dev/sdc In Figure 6-31, a new hard disk has been installed in the system and fdisk is being used to create a partition Notice in Figure 6-31 that, because this is a new disk in the system, it has to be initialized with a disk label The fdisk utility takes care of this for you when you load the program However, the change won t be applied until you write the disk
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Manage Disk Partitions
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6: Managing the Linux File System
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With fdisk running, you have a Command: prompt that you can use to enter fdisk commands At this point, one of the best things you can do is to press to view the fdisk help When you do, a list of commands is displayed that you can use to perform actions with fdisk These are shown in Figure 6-32 Notice in Figure 6-32 that you can press D to delete an existing partition Be very careful about using this action Any data on that partition will be lost! Once the changes are committed to disk, they are not reversible You can back off from changes made with fdisk without committing them to disk by pressing Q With fdisk, Q is your friend! Before creating a partition, you should press to view any existing partitions on the disk This will help you determine if there is sufficient space and, if there is, what number must be assigned to a new partition created on the disk To create a new partition, you press You can then specify whether you want to create a primary disk partition or an extended disk partition Any hard disk in your system can have up to four partitions defined in its partition table These can
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FIGURE 6-32
fdisk commands
Manage Disk Partitions
be either primary or extended partitions Generally speaking, you can simply use primary partitions However, if you want to create more than four partitions on the disk, you should create at least one extended partition Extended partitions are great Within one extended partition, you can create many logical partitions This allows you to get around the four-partition limitation The general rule of thumb is to create your primary partitions first, then create your extended partition and create your logical partitions within it To create a primary partition, press when prompted To create an extended partition, press You are then prompted to specify a partition number, as shown in Figure 6-33 You need to specify the next available partition number for the partition being created In other words, if your disk already has two partitions on it, you would enter 3 If you try to enter a partition number that s already being used by an existing partition, the fdisk utility will complain! At this point, you must specify the size of the partition This is done by specifying the beginning and ending cylinders You first specify the cylinder that you want to
Specifying the partition number
FIGURE 6-33
6: Managing the Linux File System
begin the partition on By default, fdisk displays the next available cylinder If you don t have any partitions on the disk, this will be cylinder 1 If you already have partitions on the disk, the next unused cylinder will be listed After specifying your start cylinder, you have several options for specifying the overall size of the partition, as shown in Figure 6-34 You can:
Enter the last cylinder to be used in the partition Enter the size of the partition in megabytes by entering sizeM For example,
you could create an 800MB partition by entering 800M After specifying the size, you should verify your new partition by pressing This will display all partitions for the disk, as shown in Figure 6-35 It s important to note that, at this point, the partition hasn t been written to disk All changes are saved in memory before being committed to disk This allows you to experiment, make mistakes, and so on with your partitions before actually making changes
FIGURE 6-34
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