El Capitan probably needs the most prep steps of any OS X system install. Specific steps for El Capitan in that support article, and you have to change your system clock before you begin the install of El Capitan. Boot to the Installer, at the menu screen, open the terminal, enter date, then press enter. We've created El Capitan USB stick from both Yosemite and El Capitan, but your experience with other versions may vary. An 8GB or larger USB flash drive or an 8GB or larger partition on some other.
With the release of El Capitan, Apple took the opportunity to give Disk Utility a facelift. You can still use the software to format a startup drive—it’s similar to the steps in the previous version.
- If you want to erase the drive on a Mac before installing El Capitan, or start over at any time, you can use a dedicated installer drive to boot that Mac, erase its drive, and then install the OS.
- Create a new partition and install OS X El Capitan on a dual-boot Mac. Open Disk Utility and select the hard drive you want to share from the menu on the left (often referred to as “Macintosh HD”). Click the “Partition” tab. Click + plus button, if you want to create a new disk partition for this disk, give it an obvious name, such as.
This how-to goes through the steps of formatting a startup drive using Disk Utility 15 in El Capitan. If you’re using an older version of Disk Utility, the steps are here.
1. Connect your drive
To format an external storage device, connect it to one of the ports on your Mac. Turn the drive on, and make sure it appears in the Finder.
If you’ve already installed El Capitan and you want to format you Mac’s internal drive, you can boot into Recovery Mode to format the drive. To boot into Recovery mode, start up your Mac and hold down Command-R. You should see a window labeled OS X Utilities. (Note: if you format your Mac’s internal drive, this will erase all of the data on the drive, including your apps, file, and the operating system.)
2. Open Disk Utility
You’ll use OS X’s Disk Utility app to format the drive. Locate Disk Utility in Applications > Utilities and open it.
If you booted into Recovery mode, select Disk Utility at the bottom of the window (see below).
3. Select the storage device in Disk Utility
Disk Utility’s left pane shows the storage devices connected to your Mac. Underneath each device are the drive’s partitions. Select the device you want to format. Then click the Erase button at the top.
If the Erase button is dimmed, it means the drive you want to format is in use and you need to boot off another drive or into Recovery mode, which was described in step 1.
4. Name and Format
A dialog box will appear. You need to enter a name for your storage device.
Click the pop-up menu for Format, and you can select one of the formats. The default selection is OS X Extended (Journaled); if you want a layer of security, you can go with OS X Extended (Journaled, Encrypted), which will encrypt your storage device. (If you don’t see the Encrypted options, that’s probably because the drive you are formatting is currently not using a GUID Partition Map. Select OS X Extended (Journaled), proceed to step 5, and then come back to step 4, repeating the step but with an Encrypted option selected.)
The “Case-sensitive” formats allow for file names with capital letters to be different from lowercase letters. So, for example, three files named FILE, File, and file can exist in the same folder. You probably don’t need to use a Case-sensitive format.
MS-DOS and ExFat are PC formats. Since we’re formatting a Mac startup drive, you can ignore these two.
5. Scheme
There’s a third selection you need to make called Scheme. For an Intel-based Mac running El Capitan, select GUID Partition Map. There are two other options you can ignore: Master Boot Record is for Windows, and Apple Partition Map is for PowerPC-based Macs (remember those?).
El Capitan Boot Menu
When you click Erase, Disk Utility will erase the data, reformat the storage device, and mount the drive on your desktop. Click Erase when you’re ready to proceed. After a few minutes, your storage device will be ready for you to install El Capitan.