Creating boot disk for Windows 7 on MacBook Pro

The built-in Boot Camp Assistant can create a USB drive if you give it the ISO.

Try using dd instead of asr.

1. Use mount to determine the device path of your attached USB disk. Find the disk itself and ignore the individual partition numbers. EG: if you get /dev/sda1 just use /dev/sda for the next steps.
2. Unmount the disk in the Finder.
3. Construct and run your dd command as such: dd if=/path/to/windows7.iso of=/path/to/usb/device

You can never use a mac formatted USB for Windows Use. This guide should help you burning a disc. http://lifehacker.com/251758/mac-tip--how-to-burn-an-iso-or-dmg-file-to-disc. Remember to insert a blank DVD (DVD+R recommended) and make sure it's blank before attempting to burn the ISO. If a message pops up about a blank disc, click do nothing or ignore it.