The DD of the Linux file system

This command notifies the system to replicate data from the underlying, not through the file system.
If source file of target file
BS Specifies how much data is copied each time during the copy process
COUNT specifies how many times (each BS data amount) is copied during the copy process


The second operation is just a copy of the source file part of the content

Copy Disk
DD IF=/DEV/SDB1 OF=/DEV/SDB2
Backup MBR
DD If=/dev/sdb Of=/tmp/a/mrb.bak bs=512 count=1
How to quickly delete a disk partition table
DD If=/dev/zero of=/dev/sdb bs=512 count=1
So the partition table of the disk is deleted.

The DD of the Linux file system