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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.

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

El Capitan 10.11.6 is now released as the latest version of Download El Capitan. For OS X El Capitan users this update is recommended. The upgrade to OS X El Capitan v10.11.6 enhances your Mac's reliability, performance and protection and is advised for all users. Solves a problem that can prevent parental control accounts from saving settings. OS X El Capitan is finally here, and if you're looking to install Apple's new desktop OS fresh from the ground up, then you'll be needing a bootable USB flash drive to get started with the process.

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?).

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.

Introduction

This project is a new and updated branch of the Yosemite tree and is targetted at OS X 10.11 El Capitan with SIP support, automatic installer detection and fake board-id injection for unsupported models of the MacPro and MacBook Pro.

Download

All downloads of boot.efi should be done from this project page. All other sources are unsupported.

Download your copy of the prebuild (32-bit) version of boot.efi for El Capitan (compiled on Microsoft Windows 10 with Microsoft Visual Studio 2015) with a black background and white Apple logo now, and verify the download by entering (either one) in a terminal window:

Or download the one for legacy hardware, with a grey background and logo for your Mac Pro and verify the download by entering (either one) in a terminal window:

Note: If the output is different, then your copy of boot.efi should not be used!

Compilation

Don't want a prebuilt copy of boot.efi then compile the source code yourself, with either Microsoft Visual Studio 2013 or 2015. The latter requires you to update the solution files, but that should be done automatically in the MS Visual Studio IDE.

Note: See also Compiling-Instructions

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Thanks To

This project would not have been possible without the help of Peter Holbrook, Mike Boss and a number of other people. Peter did all compiling and Mike ran dozens of test builds that Peter pushed out over at forums.macrumors.com Awesome work guys. Job well done!

I'd also like to thank everyone else whoh helped with testing our nightly builds. Thank you so much!

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Help

If you need help with the setup then please visit this macrumor thread. Developers, or people who need help with compiling boot.efi themself, can visit this macrumors developer thread.

Note: I myself don't own any unsupported Apple hardware with a 32-bit EFI implementation, so I can probably do not much for you, but there may be others to help you.

Bugs

Bugs can be reported here

Note: Please provide a clear step by step procedure to reproduce the bug. Thanks.

License

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My work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License and as such you must add a link to this license. Even if you only use a download link. Also note the term 'NonCommercial' because I don't want to see my work end up anywhere else but here.

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Note: 'Tiamo' released his work under a BSD-3-Clause license