. OS X Lion installer. This is. 8 GB USB flash drive. You can use a larger drive if you wish, but more important than the size of the flash drive is its speed.
Here are the steps to boot Mac from the USB flash drive: Power on the system. Press and hold the Option (Alt) key on the keyboard when the computer starts. Select the USB drive as a startup disk when the option appears. Method #1: Create A Bootable Windows 10/8/7 USB on Mac with Bootcamp. As a dual-boot booting tool, Boot Camp Assistant is highly regarded in the field of creating Windows 7/8/10 bootable USB since it was released, it provides the ability to download drivers, re-partition, and add new partition on your Mac.
If you're buying a new flash drive just for Lion, we recommend buying one of the fastest available. While slow (read: inexpensive) flash drives will work fine, you'll find that both the time it takes to create the bootable flash copy of the OS X Lion installer and the time it takes to install Lion on a target drive, will be somewhat long. Some free time. The creation time varies by the speed of the USB flash drive, but plan on 30 minutes to over an hour. Insert the USB flash drive into your Mac's USB port. Launch Disk Utility, located at /Applications/Utilities. In the Disk Utility window, look for the flash drive in the list of attached devices.
Look for the device name, which usually appears as the drive size followed by the manufacturer's name, such as 16 GB SanDisk Cruzer. Select the drive (not the, which may appear below the drive manufacturer's name), and click the Partition tab.
Use the Volume Scheme drop-down window to select 1 Partition. Enter a name for the volume you're about to create. We prefer to use the name that Apple originally assigned to the Lion installer image that we'll copy in a later step, so we enter Mac OS X Install ESD as the volume's name.
Make sure the Format drop-down menu is set to Mac OS X Extended (Journaled). Click the Options button, select GUID as the Partition Table type, and click OK. Click the Apply button. Disk Utility will display a sheet asking if you're sure you want to partition your USB flash drive. Click Partition to continue.
Once Disk Utility finishes formatting and partitioning the USB flash drive, quit Disk Utility. Launch Disk Utility, if it's not already open. Click the flash drive device (not the volume name) in the Disk Utility window. Click the Restore tab. Drag the InstallESD.dmg from the device list to the Source field. Drag the Mac OS X Install ESD volume name from the device list to the Destination field. Make sure the Erase Destination box is checked.
Click Restore. Disk Utility will ask if you're sure you wish to perform the restore function. Click Erase to continue. You may be asked for your administrator account password; supply the necessary information and click OK. The clone/restore process can take a bit of time.
Once the process is complete, you can quit Disk Utility.Using the Bootable Flash Drive.
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January 2023
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