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I was trying to create a bootable disk to install Windows 10 on one of my PCs. I was doing it on my Mac using a 500GB external hard disk.

This is the command I have used on the Terminal to change the Windows 10 ISO to an IMG.

sudo dd if=./Win10_1511_SingleLang_English_x32.img.dmg of=/dev/rdisk2 bs=1m

Now when I try to open the Disk Utility to format the hard disk and to get the storage back I get an error. It is also only reading 2.9GB instead of 500 and seems like it's not seen as a storage disk at all.

How do I get my 500GB hard disk back? :)

Thanks for any suggestion

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  • First, be 100% sure that /dev/rdisk2 is the proper device. With that done, try using the same sudo dd... command you used immediately, but substitute if=/dev/zero for the .dmg file you used in the first place. This won't make the disk immediately useable, but it should make it possible for Disk Utility to make it useable.
    – Rod Smith
    Commented Nov 21, 2015 at 23:21

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