Once the source and destination fields are selected, click the Restore button.Next, drag-and-drop the partition created on the USB to the text box next to Destination ( Figure E). Next, click the Image button next to Source and point to the InstallESD.dmg file recently copied to the desktop.
#Minimum usb drive size for mac install install
Launch Disk Utility and click on the partition to copy the install files to, then click the Restore tab.Drill-down through the Contents | Shared Support directories and drag-drop the InstallESD.dmg to the desktop ( Figure D).This reveals the contents of the installer itself and makes navigating the structure possible. Right-click the installer and select Show Package Contents from the context menu ( Figure C).Apple OS X 10.7 (Lion), 10.8 (Mountain Lion) Certain versions of OS X will require a different procedure to complete. With the drive now partitioned properly, see the sections below to go about copying the media/installer contents to the drive. Click the Options button, select the GUID Partition Table, and then click OK and Apply to commit the changes ( Figure B).I suggest naming each partition with the OS X version that will occupy the space to make it easier to identify later ( Figure A).
However, the limit is really based on the total capacity of the drive to be used. Partitioning the driveįor the purposes of this article, I'll be creating three installers of OS X: 10.8, 10.9, and 10.10. Also, since many Macs include SD card readers, a large capacity SD card could be used instead of a USB drive as well. When considering the requirements, particularly the flash drive size and speed, I recommend accommodating a minimum of 8 GB per OS X installer and preferably supporting USB 3.0 specification for faster file transfers as opposed to USB 2.0, which will work admirably, but slower.
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