In the bottom pane, check that the “Partition Map Scheme” is set to “GUID Partition Table” (which means it is Mac OS X bootable). Once the format completes, make sure that the USB flash drive is selected in the left-hand pane.This format operation will take less than a minute to complete. Click the “Erase…” button and then the “Erase” button.Click on the “Erase” tab, select “Mac OS Extended (Journaled)” for “Format” and input a name like “Snow Leopard Install USB” (or anything because this will be overwritten later).On the left-hand pane, select the USB drive (not the FAT32 or other partition under it).Format it as a Mac OS X bootable drive by following these steps: The DMG file creation can take 20 minutes or longer.įormat USB Flash Drive as Mac OS X Bootable Leave the defaults of “compressed” for “Image Format” and “none” for “Encryption”. Select the location to save the DMG file (“Mac OS X Install DVD.dmg”) to.Click on the “New Image” icon, located in toolbar at the top.On the left-hand pane, select the “Mac OS X Install DVD” by clicking on it.If you don’t see the “Mac OS X Install DVD” even after waiting for a while, try closing and starting the “Disk Utility” application again.A “Mac OS X Install DVD” disk icon will also appear on the desktop. On the left-hand pane, you will see “Mac OS X Install DVD” appear under the DVD drive when the DVD is mounted.Run the “Disk Utility” application (under the “Applications/Utilities” folder).Insert the Snow Leopard 10.6 “Mac OS X Install DVD” disk into the DVD drive.I just wanted a DMG file for speed and convenience in case I need to clone to a dual-layer DVD or to another USB flash drive. You can skip creating a DMG (Disk iMaGe) file if you clone directly from the Snow Leopard “Mac OS X Install DVD” disk to the USB flash drive. If you want to boot the USB flash drive on a PowerPC-based Mac, please see the comments. The resulting USB flash drive will boot on Intel-based Macs only. Note: I’m doing the following on a Macbook running Snow Leopard. And the USB flash drive is more portable and robust than a DVD. I can use it with a Macbook Air or Pro Retina which do not come with a DVD drive. It would be faster than reading from a DVD. I thought it would be useful to put the Mac OS X 10.6 Snow Leopard installer on a USB flash drive. The instructions below will not work for Mac OS X 10.7 Lion or later versions. Update: Go to Bootable USB Flash Drive to Install Mac OS X 10.10 Yosemite if you want to install Mac OS X 10.9 Mavericks or Mac OS X 10.10 Yosemite instead.

Clone dvd for mac