Lesson 10 using Fdisk for Disk Management FDISK is an old partition tool from IBM that supports most operating systems, and almost all Linux distributions have Fdisk installed, Included in Linux rescue mode can still use, FDISK is an MBR-based partitioning tool, so if you use GPT, you cannot partition with Fdisk Note: The FDISK command only has super super Level user rights to operate fdisk-l can list all installed hard disk and partition information &nbs P FDISK/DEV/SDB can partition the target disk: &N Bsp instance: First, use fdisk-l To view our system's current drive information, such as &N Bsp &NBSP ; Then we use:  FDISK/DEV/SDB to partition the SDB disk into the partition command, &NBS P This time, we can enter M view command help See, n add A new partition create a New section 1, creating a primary partition Parimary partition steps like &N Bsp &NBSP ; Here, we follow the command prompt to enter n, & nbsp   Next, the system prompts us: What partition do we need to create? E Extended extended partition, p primary partition Main division &N Bsp We remember what we said earlier: Due to the partitioning mechanism of MBR: 446bytes Install boot loader boot LOA der () nbsp , &NB Sp + &N Bsp , &NB Sp , &NB Sp 64bytes (16*4) record zoning information &NBsp , &NB Sp , &NB Sp + &N Bsp , &NB Sp , &NB Sp 2bytes  55AA, permanent marking means the system is bootable &NBSP ; , &NB Sp &NBsp =512bytes and nbsp So, we can create up to 4 primary partitions, where we create a primary partition, and the rest are created as expanded partitions &NBSP ; Continue above command operation: Input p-> system prompt input The area code (partition number (1-4), the numbers here also proves what we said above) we enter 1 &NB Sp First cylinder asked us to enter the starting cylinder number, the default value is 1, we do not enter, using the default value the ->last cylinder, terminating cylinder number or partition size, we enter: +2g &NBSP ; Complete, at this point, enter P to view the disk information, we can see the information we just partitioned, nbsp Next, we're going to expand the partition , we created the extended partition with the remaining disk space, as we said in the previous section, there is no way to use the expanded partition, which means that data cannot be formatted and stored. When we divide the extended partition, enter n &N Bsp We can see that there is no extended this option at this time, but rather the option of logical this logical partition, which is the addition of the logical partition in the extended partition, We can physically use this space only after the extended partition is divided into logical partitions. The partition number must be greater than or equal to 5, because 1-4 is the reserved word for the primary and extended partitions. Next, logical partitioning, We're divided. Two logical partitions: SDB5 and SDB6. NOTE: When the partition is complete, our partition information is still in memory at this time, once our own power loss or lock screen, etc. Then our partition information disappears, our efforts just now in vain, at this time, we see the command table has a: W Write table to disk and exit Use this command to write our partition information to the 64bytes of the MBR of the disk. After executing the command you can see that the partition table has been altered, the partition table has been modified, calling IOCT () to read partition Table calls the Ioct () method and reads it back into the partition table. If we don't want to live the partition there are some undesirable places, we can make any changes before the W command, of course, but also use Q Quit without saving changes, exit Do not save changes Let's take a look at what we just did. The partition is out. &NBSP ; Note here: Sometimes, although we have written the partition information to our partition table, our system may not be updated. does not show the partition information we created, we can use partprobe command to update the kernel Section info Generally we need to set up our partition's id after partitioning, this ID is actually the identity partition is a Type of partition, such as we modify partition ID command: t Change a partition ' s system id & nbsp Original partition information, note id    Edit the partition ID, here we are prompted to enter uppercase L to see a list of 16-digit meaning, and then we will change the SDB6 into a swap partition, Just enter 82 to go &N Bsp View post-change zoning information &NB Sp and above, if you confirm the changes, be sure to use the W command to save the changes
Linux Entry Basics _centos (ii)--FDISK partition
