Win32 Disk Imager is a simple open source application that writes CD or DVD image files to a USB or SD card, creating a virtual disk drive.
Just unzip the program (no installation required), select the image you want to create from your hard drive and finally the device where you want it written to, and that's it, in a few seconds your pen drive or your memory card will become a virtual CD.
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You can also go back and create an image by copying the data on the storage device, but you can't create it from a CD, for that you will need a different program.
Win32 Disk Imager is a simple program that carries out its function to perfection without wasting valuable resources.
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If the copied SD card is 4GB and you copy it onto an 8GB SD, it will only be 4GB. The rest will not be allocated, and it will be impossible to extend the partition.
Software perhaps not very simple for everyone but very useful; I use it to make images of SD cards to clone once patched.