How to erase imac hard drive and reinstall macos?

1. Start up your computer in macOS Recovery:
2. In the Recovery app window, select Disk Utility, then click Continue.
3. In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar.

People ask also, how do I wipe my imac hard drive Mac?

1. Turn on your Mac and continue to press and hold the power button until the startup options window comes up.
2. When the Utilities window appears, select Disk Utility.
3. In the sidebar, choose Macintosh HD.
4. Click the “Erase” button, then select a file system format and enter a name for it.

Similarly, how do I wipe my Mac hard drive and reuse it? To wipe your mechanical drive, open Disk Utility, which you’ll find in Applications > Utilities. Connect the drive you want to securely delete, then click it in the sidebar. Make sure you click the drive you want to securely delete: you do not want to erase some other hard drive by mistake!

Beside above, how do I restore my Mac computer to factory settings?

1. Restart your computer: hold the power button > select Restart when it appears.
2. While the computer restarts, hold down the ‘Command’ and ‘R’ keys.
3. Once you see the Apple logo appear, release the ‘Command and R keys’
4. When you see a Recovery Mode menu, select Disk Utility.

Also know, how do I restore my Mac to factory settings? Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Release the keys after about 20 seconds. This clears user settings from memory and restores certain security features that might have been altered.

How do you clear everything off a Mac?

How long does it take to erase Mac hard drive?

Since the actual formatting of the drive takes less than a minute with Apple’s Disk Utility, the disk formatting time is negligible. Therefore, the 7-pass erase on the 500 gigabyte drive took 18 hours and 22 minutes (1102 total minutes).

How do you restore Internet on a Mac?

1. Shut down your Mac.
2. Hold down Command-Option/Alt-R and press the Power button.
3. Hold down those keys until you a spinning globe and the message “Starting Internet Recovery.
4. The message will be replaced with a progress bar.
5. Wait for the MacOS Utilities screen to appear.

How do I erase my hard drive fast?

Go to Settings > Update & Security > Recovery, and click Get Started under Reset this PC. You are then asked if you want to keep your files or delete everything. Select Remove Everything, click Next, then click Reset. Your PC goes through the reset process and reinstalls Windows.

How do I permanently erase my hard drive?

1. Step 1: Back up your hard-drive data.
2. Step 2: Don’t just delete files from your computer.
3. Step 3: Use a program to wipe your drive.
4. Step 4: Physically wipe your hard drive.
5. Step 5: Do a fresh installation of the operating system.

Why can’t I erase my external hard drive Mac?

It’s not usually possible to erase the startup disk because your Mac is using it to run macOS. Recovery Mode is a special partition on your Mac you can use to restore from a backup, reinstall macOS, get online support, or erase your startup disk. You should back up your Mac before trying to erase or reformat it.

How do I do a factory reset?

1. Tap Apps.
2. Tap Settings.
3. Tap Backup and reset.
4. Tap Factory data reset.
5. Tap Reset Device.
6. Tap Erase Everything.

How do I do a hard reset on a MacBook Pro?

1. To force a restart your MacBook, you need to press and hold down the Command (⌘) button, the Control (Ctrl) key, and the power button at the same time.
2. Hold these keys down until your MacBook’s screen goes blank and the computer restarts itself.

How do I restore my iMac to factory settings without CD?

Will a factory reset remove viruses Mac?

If your PC, Mac, iPhone or Android smartphone becomes infected by a virus, a factory reset is one way of potentially removing it. However, a factory reset should always be approached with caution. You will lose all your data. … It does remove viruses and malware, but not in 100% of cases.

How do I factory reset my 2009 iMac?

1. Shutdown iMac.
2. Unplug power cord from back of iMac.
3. Press and hold power button for 20 seconds.
4. Restore power cord; power on iMac.
5. Immediately on hearing Startup Chime, press and hold Command-Option-P-R keys (⌘⌥ P R)