Free nuts

To make a Mac act as an external hard disk, you can put it in TargetDisk Mode and connect it to another Mac with a FireWire orThunderbolt cable, as follows:

How to Map a Network Drive on Mac. Instead of downloading or copying the same data to all your devices, you'd save this data in a single folder, then share this folder with other devices. Once you have shared the location of this data via a UNC path, you can then map the network drive to all your devices with a few simple steps.

1. The most basic way to check free disk space on a Mac is by using Finder. Open a new Finder window by pressing Command+N or selecting File New Finder Window in the menu bar. (You can also use a little-known shortcut to open one from anywhere.) In the window that opens, click on the drive you’d like to check in the sidebar.
2. Change the Finder settings. One of the most common reasons for Mac not recognizing external.
3. Create a backup. Make sure that you have a current backup of your important files.

Note: Target Disk Mode is available on most recentMacs; however, computers that do not have FireWire or Thunderboltports are excluded.

1. Shut down the computer you want to use as an external hard disk(i.e., the target computer). If you are using a portable computer,make sure it is running on AC power. You don't need to power downthe other computer (i.e., the host computer).
2. Connect the FireWire or Thunderbolt cable to the correspondingport of the target computer, and then connect the other end of thecable to the host computer's port.Note: If the computers have different kinds of ports(e.g., one has a FireWire 400 port while the other has a FireWire 800or Thunderbolt port), you will also need one or more adapters.
3. Start up the target computer and hold down the lettert on its keyboard. Its drive will spin up, andits icon should appear on the host computer. The target computer'sdisplay will show a moving icon.

Alternatively, you can do the following:

1. From the Apple menu, select System Preferences....
2. In System Preferences, from the View menu, selectStartup Disk.
3. In the Startup Disk preference pane, click Target Disk Mode....

To exit Target Disk Mode, on the host computer, eject thetarget computer's disk, and then shut down thetarget computer. Disconnect the cable, and then start up thetarget computer; it will boot normally.

Moving to a new Mac? Before taking these steps, you can use Migration Assistant to move your files from the old Mac to your new Mac.

Format Hard Drive For Mac

Create a backup

Make sure that you have a current backup of your important files. Learn how to back up your Mac.

Sign out of iTunes in macOS Mojave or earlier

If you're using macOS Mojave or earlier, open iTunes. From the menu bar at the top of the screen or iTunes window, choose Account > Authorizations > Deauthorize This Computer. Then enter your Apple ID and password and click Deauthorize.

Learn more about deauthorizing computers used with your iTunes account.

Sign out of iCloud

If you're using macOS Catalina or later, choose Apple menu  > System Preferences, then click Apple ID. Select Overview in the sidebar, then click Sign Out.

If you're using macOS Mojave or earlier, choose Apple menu  > System Preferences, click iCloud, then click Sign Out.

You will be asked whether to keep a copy of your iCloud data on this Mac. You can click Keep a Copy, because you're erasing your Mac later. Your iCloud data remains in iCloud and on any other devices that are signed in to iCloud with your Apple ID.

Sign out of iMessage

If you're using OS X Mountain Lion or later, open the Messages app, then choose Messages > Preferences from the menu bar. Click iMessage, then click Sign Out.

Reset NVRAM

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 To See The Hard Drive On Mac Os X 10 6 8

Learn more about resetting NVRAM or PRAM.

Optional: Unpair Bluetooth devices that you’re keeping

If your Mac is paired with a Bluetooth keyboard, mouse, trackpad, or other Bluetooth device that you plan to keep, you can unpair it. This optional step prevents accidental input when the Mac and device have separate owners but remain in Bluetooth range of each other.

If you're unpairing Bluetooth input devices from a desktop computer such as an iMac, Mac mini, or Mac Pro, you must plug in a USB keyboard and mouse to complete the remaining steps in this article.

To unpair a Bluetooth device, choose Apple menu  > System Preferences, then click Bluetooth. Move your pointer over the device that you want to unpair, then click the remove (x) button next to the device name.

Erase your hard drive and reinstall macOS

The best way to restore your Mac to factory settings is to erase your hard drive and reinstall macOS.

After macOS installation is complete, the Mac restarts to a setup assistant that asks you to choose a country or region. To leave the Mac in an out-of-box state, don't continue setup. Instead, press Command-Q to shut down the Mac. When the new owner turns on the Mac, the setup assistant guides them through the setup process.

No matter the model or condition, we can turn your device into something good for you and good for the planet: Learn how to trade in or recycle your Mac with Apple Trade In.