There a few ways that Disk Utility can format your external hard drive. From the dropdown menu labeled "Format", select the format of your choice. You should choose depending on your intentions for your external hard drive. These are the most common formats: Works natively with newer versions of Mac OS X Can work with large file sizes.
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- KB Parallels: Unable to write on the external hard drive with NTFS file system.
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This is the best option for cross-platform compatibility. Works only with Mac OS.
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Completely incompatible with Windows computers. This is the best option if you intend to use your external hard drive exclusively with computers running Mac OS. Works natively with Windows, Mac OS write-capability can be added using the steps in the previous Method. This is the best option if you intent to use your external hard drive exclusively with computers running Windows.
Click "Erase". This will prompt Disk Utility to commence reformatting your drive. The reformatting process should complete within a few minutes. Write to your drive. After reformatting, try copying some files to your external hard drive.
Apply permissions to all items in a folder or a disk
Your drive will now be able to accept files written from Mac OS X. Include your email address to get a message when this question is answered. Already answered Not a question Bad question Other.
Warnings Make sure to back up all files before attempting reformatting, as any files remaining on the external drive will be deleted. Edit Related wikiHows. Mac OS X In other languages: Is this article up to date? Allows a user to open the item and change it. Read Only: Allows a user to open the item, but not change its contents.
No Access: Blocks all access to the item. Make sure the Info window remains open after making your changes.
How to Write to an External Hard Drive on Mac OS X: 15 Steps
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