Create Disk Image

• Create A System Image Iso
• Create A Disk Image In Windows 10

Creating a bit-identical disk image is one way to ensure the system backup will be exactly as the original. Bit-identical images can be made in Linux with dd, available on nearly all live CDs. Most commercial imaging software is 'user-friendly' and 'automatic' but may not create bit-identical images.

1. Create a system image for your full Windows 10 backup You'll find the 'Create a system image' option under the 'Control Panel Home' heading. Click it and confirm your administrator credentials to.
2. You can create hard disk images in pure kilobytes if you wanted, e.g. 30000000k for 30 gigabytes. M - M stands for M egabytes. For instance, 100M would be 100 megabytes. You can also create hard disk images in pure megabytes if you want, e.g. 30000M for 30 gigabytes.
3. Create a Disk Image in Windows This will essentially take a snapshot of the drive and make it bootable so you can restore your PC to that moment in time if your drive crashes. There are a number of third-party tools that you can use to do this, but Microsoft actually has included the ability to create a disk image right within Windows.

This page documents how to create a hard disk image in QEMU.

The command[edit]

The standard command for creating a basic hard disk image is this.

It will create an output similar to this:

The command is broken down like this:

• qemu-img - This is the name of the program. It is necessary for using the following command.
• create - This tells qemu-img that we are creating a disk image. Other arguments include 'dd', 'info', 'map', 'measure', 'snapshot', 'rebase', and 'resize'. This will be described in more detail later on.
• -f - An argument that specifies which file format we are going to be using.
• qcow2 - The file format we are using, in this case qcow2. qcow2 is the recommended since it is dynamically allocated - e.g. it only allocates space when needed, but at a (pretty much) unnoticeable speed loss. There are many other file formats, which will be listed below.
• example.img - This specifies the name of the image we are going to be using. It can be whatever, and have whatever extension (or none at all), it doesn't matter.
• 100M - This specifies the size of the virtual disk. 100M stands for 100 megabytes. Of course modern operating systems take up much more than that, so it's recommended to make it at least 30 gigabytes or more, which can be done by replacing 100M with 30G. The following letters are excepted:
  • K - K stands for Kilobytes. For instance, 100K would be 100 kilobytes. Unrecommended. You can create hard disk images in pure kilobytes if you wanted, e.g. 30000000k for 30 gigabytes.
  • M - M stands for Megabytes. For instance, 100M would be 100 megabytes. You can also create hard disk images in pure megabytes if you want, e.g. 30000M for 30 gigabytes.
  • G - G stands for Gigabytes. For instance, 100G would be 100 gigabytes.
  • T - T stands for Terabytes. For instance, 1T would be 1 terabyte.
  • P - P stands for Petabytes. For instance, 1P would be 1 petabyte. Unrecommended unless you happen to have a supercomputer handy.
  • E - E stands for Exabytes. For instance, 1E would be 1 exabytes. Unrecommended unless you happen to have a supercomputer handy. Fun fact: The ext4 file system is capable of a maximum of 1.1529215 exabytes.

File formats[edit]

QEMU can recognize and read several different file formats, but this section will list the ones you can create with qemu-img.

Create A System Image Iso

qcow2[edit]

The recommended file format. It is fast, dynamically allocated, and has decent support in QEMU. However it does have a minor speed loss compared to raw, but this is unnoticeable in normal use.

qcow[edit]

This is an older version of the qcow2 file format. The main difference between the qcow2 and qcow file formats is that qcow2 supports multiple snapshots through a newer, flexible model for storing snapshots. It is recommended to use qcow2 instead.

Create A Disk Image In Windows 10

raw[edit]

As the name suggests - it is a 'raw' file format, which means it will allocate all the space to the disk immediately, e.g. if you formatted a file named raw with 2G as the size, it would take up 2 gigabytes of space on the disk. This is the fastest option, and is recommended if you have a lot of disk space to spare.

vdi[edit]

A file format which is also compatible with VirtualBox 1.1. Recommended only if you are going to be switching through VirtualBox and QEMU frequently.

• static - If set, the image will be created with metadata preallocation.

vmdk[edit]

A file format which is compatible with VMWare 3 and 4. Recommended only if you are going to be switching through VMWare and QEMU frequently. It supports the following arguments:

• compat6 - Create a VMDK 6 image, instead of the default VMDK 4.
• hwversion - Specify the vmdk virtual hardware version. If set, the Compat6 flag cannot be enabled.

vpc[edit]

A file format which is compatible with Windows Virtual PC. Recommended only if you are going to be switching through Windows Virtual PC and QEMU frequently.

vhdx[edit]

A Hyper-V compatible image format. Not recommended unless you're going to switch between Hyper-V and QEMU frequently.

parallels[edit]

A Parallels compatible image format. Not recommended unless you're going to switch between Parallels and QEMU frequently.

file[edit]

Not a file with any format - just a plain raw file.

cow[edit]

Ancient, depreciated QEMU file format that is not present in newer versions. Like qcow2 and qcow, it is a dynamically allocated file format. This cannot be used in Win32. Not recommended.

Read only file formats[edit]

• bochs - Bochs image file
• cloop - Linux Compressed Loop image, useful only to reuse directly compressed CD-ROM images present for example in the Knoppix CD-ROMs.
• dmg - Apple disk image

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You can use installation media (a USB flash drive or DVD) to install a new copy of Windows, perform a clean installation, or reinstall Windows 10.

To create installation media, go to the software download website, where you'll find step-by-step instructions. On that website, you can select a version of Windows and create your own installation media using either a USB flash drive or a DVD. To go directly to one of the versions, select one of these links:

• Windows 10 (Then select Download tool now.)

Important: Back up your files before you install or reinstall Windows on your PC. Learn how for Windows 10 or for Windows 7 and Windows 8.1.

To create the installation media, here's what you'll need:

• A PC with a reliable internet connection. The download time will vary, depending on your internet connection.

• A USB flash drive or DVD. A blank USB flash drive with at least 8 GB of space, or a blank DVD (and DVD burner). We recommend using a blank USB or blank DVD because any content on it will be deleted. When burning a DVD from an ISO file, if you're told the disc image file is too large, you'll need to use dual layer (DL) DVD media.

• A product key. Your 25-character product key (not required for digital licenses). For help finding it, go to Find your Windows product key.

After you've created the installation media, you can reset or reinstall Windows. To learn more, go to Recovery options in Windows 10.