Introduction
This article illustrates how to copy an entire data partition from Master Boot Record (MBR) to MBR in another Windows system using Msys/mingw64 and the dd command.
Prerequisites
Before proceeding with the steps, ensure the following:
- Both the source and target systems are running Windows.
- Msys/mingw64 is installed on the target system.
- You have the necessary administrative privileges on both systems.
- The source and target partitions are of the same file system type.
DD Command Syntax
The dd command is a versatile tool for copying and converting files. In our scenario, we'll use it to copy a data partition from one location to another. The syntax for the dd command is:
dd if= of= bs= [count=] [conv=] [status=progress] Copying Data Partition using DD Command
To copy a data partition from the source system to the target system using the dd command, follow these steps:
- Open the Command Prompt on the target system as an administrator.
- Mount the source partition using a tool like
Explorer.exeordiskmgmt.msc. - Identify the source partition's device path. For example, if the source partition is mounted at
Z:, its device path might be/dev/sdX. - Use the following command to copy the partition:
dd if=\\\.\PhysicalDriveX\of=/dev/sdY bs=64K count=1 iflag=direct conv=sync,noerror
Replace X with the physical drive letter of the source system and Y with the physical drive letter of the target system.
Explanation of DD Command Options
Here's a brief explanation of the options used in the dd command:
if=: Input file.of=: Output file.bs=: Block size.count=: Number of blocks to copy.conv=: Conversion options.status=progress: Display progress during the copy process.
Direct I/O (iflag=direct)
The iflag=direct option is used to enable direct I/O, which bypasses the system cache and reads data directly from the disk. This can improve performance, especially when dealing with large files or partitions.
Sync and Noerror Options
The conv=sync option ensures that all data is written synchronously to the target disk, while the conv=noerror option instructs dd to continue copying even if it encounters read errors.
Example
Assuming the source partition is mounted at Z: on the source system, and its device path is /dev/sda1. The target system has an empty partition at /dev/sdb1.
To copy the source partition to the target system:
dd if=\\\.\PhysicalDrive0\Z:\ if=/dev/sdb1 bs=64K count=1 iflag=direct conv=sync,noerror
In this article, we learned how to copy an entire data partition from an MBR to another MBR in another Windows system using Msys/mingw64 and the dd command. We also discussed the various options used in the dd command and their purposes.