How to Open Disk Utility on a Mac. Disk Utility is a hard disk management application that comes with the Mac operating system. The software offers a number of hard drive management functions ...

Open Disk Utility and select the bare-bones Mac OS X for Intel installation partition (where you just installed Mac OS X for Intel) in the left-hand pane.

Disk Utility would not open. On my Mac mini upstairs running snow leopard 10.6.4 there was no problem opening Disk Utility. Has anyone else had this problem?

Step 1: Open Disk Utility and click File → New Image → Blank Image. ... Step 2: Use the following parameters, but change the Size of the disk to whatever size you need.

Click the Erase button and wait for Disk Utility to finish. Close Disk Utility and open up a Terminal window. Copy and paste the command from this forum post into the Terminal. Press Enter.

Disk Utility has remained more or less the same for years, but Apple has given the much-loved maintenance tool a big overhaul in El Capitan.