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Double-check to make sure you have the correct drive. **WARNING** The contents will be overwritten in the next steps.ĭetermine which device the USB drive is assigned as by opening the Terminal and typing the following command. Insert a USB flash drive into a USB slot. For the free edition of MemTest86, this file is called, memtest86-usb.img Inside the Zip there is a "disk image" file.

Weve seen it too on some Macs, but as you say, it still works just fine. However it appears that this has no effect on the restore, and the USB is usable afterwards. Get a lifetime subscription to VPN Unlimited for all your devices with a one-time purchase from the new Gadget Hacks Shop, and watch Hulu or Netflix without regional restrictions. This is the image file that contains the information you need to create the backup disk. Image via Once inside, browse to the Contents SharedSupport folder where there will be a file called InstallESD.dmg. Image via Simply download the app and in a few clicks (and about 30 minutes) your disk will be finished.Ĭlick on Show Package Contents and then find the folder called Shared Support. Image via You can find out more on how to do this here. If youre using a USB drive, it has to be formatted as Mac OS Extended (Journaled) and set to partition type GUID Partition Table in order to work. You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. Heres how to create a bootable backup disk and save yourself some time.īut before you do anything else, a word of caution: once youve used the OS X installer, it will automatically delete the file you need to make the backup disk, so youll want to either make a copy of the installer or create your disk before you upgrade. If you have multiple Macs, youve probably been dreading the long process of downloading and installing it on all of them. The default will be set to the maximum, so you can reduce that. It can be used for burning both ISO files and DMG files to USB to create a bootable drive.įollow the steps below to Create a Bootable Mac OS USB on Windows PC. Then you can insert it into your Mac, hold down the option key while turn on and boot your system with this USB.