How to Clear an External Hard Drive

If you want to clear an external hard drive of everything on it, you will need to erase, or format, the drive. The first step is to make sure everything on the external hard drive is backed up, on another hard drive, a flash drive or a CD or DVD. Trying to recover items that have been deleted from a hard drive is not always possible.

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Clear data from an external hard drive by formatting the hard drive.

Windows Operating Systems

Step

Make sure the external hard drive is connected to the computer.

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Log in to the computer as an administrator.

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Click "Start," then right-click "My Computer" and then click "Manage."

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Click "Disk Management."

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Right-click on the external drive you want to erase, for example the drive labeled "E" or "F." Click "Format."

Step

Assign a name to the external hard drive, such as "Backups," then click "OK."

Step

Click "OK" again at the Windows dialog prompt warning you that formatting the drive will erase all the data. Windows will then format the external drive and make it available for use again.

Macintosh Operating Systems

Step

Make sure the external hard drive is connected to the computer.

Step

Click on the "Applications" folder in the dock, then navigate to "Disk Utility" to start the program.

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Click on the external drive you want to erase; for example, the one labeled "Backups."

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Click on the "Erase" tab at the top, between the "First Aid" and "RAID" tabs. Leave the "Format" option at its default "Mac OS Extended" for typical hard drive formatting.

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Click on the "Erase" button at the bottom right. Click "Erase" again at the prompt warning you that erasing the disk will delete all its data. It will then erase the disk and make it available for use again.