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This article mainly introduces the dd command backup Linux system example analysis, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Example 1: back up the entire hard disk

Use the dd command to back up the entire hard drive. In this example, the device name of the source hard disk is / dev/ sda, and the device name of the destination hard disk is / dev/ sdb. Execute the dd command to back up the entire hard drive / dev/sha to another hard drive / dev/sdb on the same system. As follows:

[root@linuxprobe ~] # dd if=/dev/sda of=/dev/sdb- "if" followed by the input file, and "of" followed by the output file. -any errors in the execution of the above command will fail. However, if you add the parameter "CONV= NOERROR", it will continue to copy even if there is an error in the execution. -input and output files must be checked repeatedly before execution. If the order of the two files is reversed, you may lose all your data.

When backing up the entire hard drive, we can also add the sync parameter to synchronize Icano. As follows:

[root@linuxprobe ~] # dd if=/dev/sda of=/dev/sdb conv=noerror,sync

Example 2: create an image of a hard disk

Use the dd command to create an image file for the hard drive and save it to another storage device. This backup method has many advantages: one is easy to use, the other is that this backup method is faster than other methods of backup, but also allows you to recover data more quickly.

Create an image command for hard disk / dev/sda:

[root@linuxprobe ~] # dd if=/dev/sda of=~/sdadisk.img

Example 3: restore hard disk image files and restore data

Use the dd command to restore the image file of the hard drive to another hard drive. As follows:

[root@linuxprobe ~] # dd if=sdadisk.img of=/dev/sdb

The Sdadisk.img file is the image of / dev/sda, so the above command will restore the image of / dev/had to / dev/sdb

Example 4: create a floppy disk image

Use the dd command to create an image backup of the floppy disk. The input file fills in the location of the floppy drive device, and the output file writes the name of the floppy disk image file, as shown below.

[root@linuxprobe ~] # dd if=/dev/fd0 of=myfloppy.img

Example 5: backup partition

Use the dd command to back up the hard drive partition. Enter the file to fill in the device name of the partition, and the output file to fill in the target path or image file you specified. An example of the dd command is as follows:

[root@linuxprobe ~] # dd if=/dev/sda1 of=~/partition1.img

Example 6: CD backup

The dd command allows us to create an iso file of the source file, so we can insert CD and enter the dd command to create a CD iso file content.

[root@linuxprobe ~] # dd if=/dev/cdrom of=tgsservice.iso bs=2048

The dd command reads a block from the input and writes it to the output file. You can specify the block size of the input and output files. The parameter "bs" specifies the block size of the input and output files. The above dd command uses a block size of 2048 bytes.

Note: if the disc is mounted automatically, it is best to drop umount before using the dd command to create an iso image to avoid unnecessary access to the CD ROM.

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