Most WD Drives come formatted in the NTFS (Windows) or HFS+ (Mac) format. For a hard drive to be able to be read and written to in both a PC and Mac computer, it must be formatted to ExFAT or FAT32 file format. FAT32 has several limitations, including a 4 GB per-file limit. This is a file system limitation that affects both Mac's.
by Shirly Chen, updated on 2018-10-08 to Mac Data Wipe
'Hi, is there any way to format an external hard drive in macOS 10.14 Mojave? I will sell an old external hard drive, I want to format the external hard drive on my Mac and remove all data.' – Maris
Many Mac users send us emails and ask how to format external hard drive, USB flash drive on Mac after they install macOS Mojave in the Mac. If you are also looking for a solution to format external hard drive/USB flash drive in macOS 10.14 Mojave, you just come to the right place. In this article, we will show you two solutions to help you easily and securely format external hard drive/USB flash drive under macOS Mojave.
Two solutions to format external hard drive/USB flash drive in macOS Mojave
There are two solutions to help you format external hard drive/USB flash drive in macOS Mojave. Two tools: Disk Utility and DoYourData Super Eraser for Mac can help you securely format external hard drive/USB flash drive under macOS Mojave. Here, you can choose one of the solutions to help you format external hard drive/USB flash drive under macOS Mojave 10.14.
Solution 1: format external hard drive/USB flash drive in macOS Mojave with Disk Utility
Disk Utility is a traditional Mac disk tool. It can help you format external hard drive/USB flash drive after you upgrade your Mac OS to macOS 10.14 Mojave. Just run this app from Launchpad and use it to erase the external hard drive/USB flash drive. It will format the external hard drive/USB flash drive and remove all data on the external hard drive/USB flash drive.
But, please note that the formatted data on the external hard drive/USB flash drive can be recovered by data recovery software after you format it with disk utility. If you want to format external hard drive/USB flash drive in macOS Mojave and permanently erase the data on the external hard drive/USB flash drive, just try solution 2.
Solution 2: format external hard drive/USB flash drive with DoYourData Super Eraser for Mac
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DoYourData Super Eraser for Mac is powerful data erasure software for macOS 10.14 Mojave. This is the secure tool to format external hard drive/USB flash drive and permanently erase data in macOS Mojave. Here, you can follow these steps to format external hard drive/USB flash drive in macOS Mojave with DoYourData Super Eraser for Mac.
Step 1: Download and install DoYourData Super Eraser for Mac.
Download and install this software on your Mac. It is fully compatible with macOS Mojave. Then run it from Launchpad.
Step 2: Choose mode 'Wipe Hard Drive'.
Run DoYourData Super Eraser for Mac on your Mac. Connect your external hard drive/USB flash drive with your Mac. Then choose this data erasure mode – 'Wipe Hard Drive'.
Step 3: Wipe and format external hard drive/USB flash drive.
Select the external hard drive/USB flash drive and click on 'Wipe Now' button. DoYourData Super Eraser for Mac will format and erase the external hard drive/USB flash drive.
Please note that once the external hard drive/USB flash drive is formatted by DoYourData Super Eraser for Mac, all data information on the external hard drive/USB flash drive will be permanently erased, can’t be recovered by data recovery software.
The two tools above can help you easily and securely format external hard drive/USB flash drive on macOS Mojave. If you are going to sell, donate or abandon your external hard drive/USB flash drive, we strongly recommend you to use the solution 2 to format your external hard drive/USB flash drive.
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If you used Time Machine to create a backup of your Mac, you can restore your files from that backup or a local snapshot on your startup disk. You might want to restore your files after the originals were deleted from your Mac, or the hard disk (or SSD) in your Mac was erased or replaced, such as during a repair.
Restore from a Time Machine backup
When you restore from a Time Machine backup, you can choose to restore all your files, or restore both the Mac operating system (macOS) and all your files.
Restore all your files
- Make sure that your Time Machine backup disk is connected to your Mac and turned on. Then turn on your Mac.
- Open Migration Assistant, which in the Utilities folder of your Applications folder.
- If your Mac starts up to a setup assistant, which asks for details like your country, keyboard, and network, just continue to the next step. The setup assistant includes a migration assistant.
- If your Mac doesn't start up all the way, or you also want to restore the macOS you were using when you created the backup, follow the steps to restore both macOS and your files.
- When you're asked how you want to transfer your information, select the option to transfer from a Mac, Time Machine backup, or startup disk. Then click Continue.
- Select your Time Machine backup, then click Continue.
- If you're asked to choose from a list of backups organized by date and time, choose a backup and click Continue.
- Select the information to transfer, then click Continue to start the transfer. This screen might look different on your Mac:
- If you have a lot of content, the transfer might take several hours to finish. When the transfer is complete, restart your Mac and log in to the migrated account to see its files.
Restore both macOS and your files
These steps erase your hard disk, then use your backup to restore both your files and the specific version of macOS you were using when you created the backup.
- Make sure that your Time Machine backup disk is connected and turned on.
If your backup disk isn't available, keep going: You might be able to restore from a local snapshot on your startup disk. - Turn on your Mac, then immediately press and hold Command (⌘)-R to start up from macOS Recovery. Release the keys when you see the Apple logo or spinning globe.
- When you see the macOS Utilities window, choose the option to restore from a Time Machine Backup.
- Click Continue until you're asked to select a restore source, then select your Time Machine backup disk. Or select your startup disk (Macintosh HD), which might have a local snapshot you can restore from.
- Click Continue. If your disk is encrypted, you're asked to unlock the disk: Enter the administrator password you used when setting up Time Machine, then click Continue again.
- Select a backup, if available, then click Continue.
- Select a destination disk, which will receive the contents of your backup. If restoring from a local snapshot, you aren't asked to select a destination.
- Click Restore or Continue. If your Mac has FileVault turned on, you're asked to enter your administrator password to unlock the disk.
- When done, restart your Mac.
Restore specific files
Learn how to use Time Machine to restore specific files, including older versions of your files.
Learn more
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- What to do if you can't restore with Time Machine. If you need help, contact Apple Support.