If you wanted to transfer to sdb and later boot from it, you must know the bytes and sectors to copy and include that in your command -- making sure your output drive has the size necessary, again /dev/sda to /dev/sdb should work except for some problems
Copying a hard drive in Linux involves making an exact duplicate of all the data, including the operating system, applications, and user files, from one drive to another.
The best practice is to boot from a USB disk or live Linux CD/DVD such as Knoppix. This ensures that all data on the source disk is in a cold state and will not be modified during the copying process, thus reducing errors. It is also a good idea to run fs
In this tutorial, we'll refer to a practical example of the Linux dd command that can be used by system administrators to migrate or clone a Windows Operating System or a Linux OS from a larger HDD partitioned in MBR or GPT layout style to a smaller S