This will wipe the USB disk and set it up with the correct boot record Select MS-DOS (FAT) in the format type.Select “Master Boot Record” in the options.Select 1 partition in the partition layout.
You have to do this manually with Disk Util and fdisk.įormat the disk in Disk Utility, with the correct MBR The issue was that UnetBootin doesn't set up the Master Boot Record correctly on the USB disk. I had a similar problem when trying to create a bootable USB disk from OSX. I could try with that step now, but it takes 1.99 hours to write the image to the USB drive so there is a huge penalty to trial and error here. Note: in the instructions I read about, they recommended renaming my Win7.iso to Win7.dmg before using DD, which made absolutely no sense to me, so I didn't do it.
How can I fix this, or correctly use dd to write a bootable cd image such that it is now a bootable usb drive? Booting the key on my Vista computer yields the error "No boot sector on USB Device'įrom what I can tell, bs=1m in the DD command should have left 1 Megabyte for the boot sector, but for some reason this area of the USB Key is not set up correctly so that it will boot I tried: sudo dd if=/Users/myusername/Win7.iso of=/dev/disk1 bs=1mĪnd this succeeded in writing the files, except in DISK UTILITY on the mac, it shows the partition type as GUID Partition Table and not 'Master Boor Record'. Okay I'm trying to create a BOOTABLE Windows7 image on a USB key from a Mac running Lion.
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