Converting .iso to .img in Mac OS X 10.6

I'm trying to convert an .iso file (Ubuntu disc image) to a .img file.

I run a command like so:

hdiutil convert -format UDRW -o ubuntu.img ubuntu-11.04-server-amd64.iso

But no matter what, I get the error: hdiutil: convert failed - not recognized

I'm not sure how to resolve this problem or how else I can convert. Any help?

Solution 1:

I had this same problem while trying to create an Ubuntu Server USB disk from a downloaded .iso file. Taking h0tw1r3's advice, I ran md5 ~/path/to/ubuntu-server.iso and it came back with a different value than the one found on the UbuntuHashes wiki page, indicating that my download was a "corrupted" .iso file.

To fix it, I opened the .torrent file from the Alternative Downloads page in Transmission, which automatically scanned the corrupt file in my Downloads folder, figured out what I was missing, and corrected the file by downloading only those parts. Three cheers for bittorrent!

Solution 2:

I had the same problem and even ran md5 check which was successful, the problem was the order of the parameters in the command.

Try this:

hdiutil convert ubuntu-11.04-server-amd64.iso -format UDRW -o ubuntu.img