Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer. Mac Os X El Capitan Bootable Usb Download – Pete Batard created Rufus for our quickly changing age exactly where DVDs are becoming a lesser amount of important, and USBs are taking over. Several computers no longer possess DVD drives for that reason holding onto installation software needs to be held in a distinct format.
I am salvaging a mid 2013 MacBook Air 11' that was discarded with a broken screen backlight due to beverage spill and missing its SSD. (I have a very tiny budget right now so I'm only spending on more expensive items when my testing shows the machine might work well.)
Restore Image from Disk Utility in El Capitan to make bootable USB But if you are creating this bootable USB installer drive for Mountain Lion on OS X Maverics (Ver. 10.9) or below then you need to go to the restore tab on the right pane and just drag and drop the BaseSystem.dmg in source field and USB drive icon to the destination field as. Just click on the setup file and with some click, the installation will finish. After that, Launch TransMac when TransMac is launched you will see the list of Flash drives or local disk. Then Right-click on that flash you want to create bootable USB for Mac OS El Capitan then select Restore with Disk Image. Restore with the Disk image.
I got the Apple Store to test the hardware then tested the computer myself by taking about two days to install OS X from one USB 2.0 flash drive to another USB 2.0 flash drive using an external display.
It seemed to work quite well other than that it ran at about 1% the speed of a normal Mac for anything that required disk access. This made it hard to test in any depth as problems could easily be due to OS X internal timeouts.
I have now purchased a USB 3.0 external hard drive and knowing how slow USB 2.0 flash drives are to install from and to, I'm hoping to use the fast external hard drive for both, but I'm not sure whether this is possible or how.
The external drive happened to come pre-formatted for Mac with two partitions, which to seems ideal.
Can I just copy the contents of the El Capitan bootable installer USB to one of the partitions? I fear I may need to copy it as a drive/partition rather than as a file or folder, since it must be bootable. Does such a copy require special software?
I need to ask the experts here without being able to experiment since I'm unable to justify the purchase price of a magsafe 2 power supply until I'm confident the machine will work well. I am able to borrow a power supply only occasionally from friends.
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I realize doing an Internet OS restore via Wi-Fi is another possibility but the Wi-Fi I have access to is both slow and behind a captive portal. So for this question I'm not pursuing that option thank you.