On your Mac, choose
Apple menu
The Apple menu is located in the top-left corner of your screen. Click it to access System Preferences and recently used apps, documents, and other items. View information about your Mac— including your version of macOS—type of processor, and amount of memory, and optimize storage.
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How do I choose my Mac startup disk?
Changing Your Mac's Startup Disk at Boot
Press the power button to turn on your Mac. Immediately press and hold down the Option key. A screen displaying all of the available startup disks appears. Select the disk you want to use as a startup disk.
What is the best disk utility for Mac?
Top 7 Mac Best Disk Repair Software
- Disk Drill For Mac (? Best Overall) Disk Drill allows you to recover deleted files on your Mac. ...
- OnyX (? Best Budget Option – Free!) ...
- Techtool Pro (? Best Hardware Monitor and Prevention) ...
- Drive Genius. ...
- DiskWarrior For Mac. ...
- AppCleaner. ...
- Data Rescue 6 For Mac.