How to create disk image?

Image Writer. :-) Seriously though, image writer can do a read from a card and save the file, then you can write that file back to image writer.

If you are looking to create a bootable system image (ex: Raspberry Pi boot image or Cyanogenmod Android image), that is a completely different issue. Utilities for this type of work exist mainly in Linux based systems, as it is far easier to create a shell script there and the base tools are already there. You don't even need an SD card to create and image file in Linux, as there are tools to create a blank file of xx size, then treat it like a drive (create partitions, format, mount, etc).

This tool was created to make it easier for Windows users to be able to write these pre-created images to a memory device (USB, SD, CF, etc).

Jeff B (skydiver38) said:

"Image Writer. :-) Seriously though, image writer can do a read from a card and save the file, then you can write that file back to image writer."

It's only a joke though I hope it could be true.

To Tobin Davis:

Thank you. May be I should go to Linux world and try to find something useful to solve this problem. But now I only want to know whether there is a software to create a backup of a runable boot image under Windows system.

I don't know about getting a runable boot image for Windows. I know that there are several utilities out there that can make a memory device bootable, like the HPUSBDisk.exe utility. There are also a lot of utilities that can take a cd image and make a bootable usb device from them (unetbootin, universal-usb-installer, etc).

In all honesty, I really don't know how far you will get in creating a boot image of Windows on removable media. I personally am a Linux developer and user, which makes this project doubly challenging.

Sorry it's not a runnable boot image for Windows. It's just for Android. Having tried some utilities, finally I find this perfect reliable fast program called R-Drive Image. Recommend to all for the same needs!