Format external hard drive mac using terminal


How to Format a Drive on a Mac

The unmountDisk verb is similar to umount , but it unmounts an entire disk instead of one volume. Disks are specified with their mount point, as seen above.

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Removable disks are things like USB hard drives and flash drives. If it connects through an interface on the outside of your computer, it qualifies as a removable drive. It mounts volumes on internal disks manually.

Only unmounted volumes can be mounted, obviously. To mount all volumes on a disk, use diskutil mountDisk disk1 , for example.

Verification involves checking the contents of the disk against the expected values. If any mismatches are found, the disk will be identified as in need of repair.


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This will run a repair pass on the volume and attempt to fix any problems found in the verification process. The eraseDisk verb handles reformatting disks, which erases all data and volumes on a single disk. The verb takes as inputs the format, new disk name and disk identifier, in that order. The new disk will have one volume named.


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  • The reformat verb will erase a single volume on the disk while keeping the same name and format. The partitionDisk verb runs an command-line version of Disk Utility, allowing you to create multiple partitions on a single disk. Partition sizes can be specified in gigabytes with the G suffix 2 G or terabytes with the T suffix 2 T. The instructions in the article below are designed to help repartition and format a hard drive.

    This process is data destructive and cannot be undone. Once the process begins, all the data on the drive will be lost!

    Repair Mac External Hard Drive without Disk Utility

    Be careful working with disks in the terminal. Incorrect actions can lead to data loss and even computer failure. Launch the Terminal app from the Utilities folder of your Applications folder, or use Spotlight to find it. When using dd or other duplication programs, always use raw device.

    Formatting a Disk Using Terminal

    Do not forget to replace the disk2 before pressing the key Enter. Do not forget to replace the rdisk2 before pressing the key Enter.


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    That should work. You can read more in this article.

    How to Erase a Disk from Command Line in Mac OS X

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    Erasing a Disk from the Command Line of Mac OS

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    format external hard drive mac using terminal Format external hard drive mac using terminal
    format external hard drive mac using terminal Format external hard drive mac using terminal
    format external hard drive mac using terminal Format external hard drive mac using terminal
    format external hard drive mac using terminal Format external hard drive mac using terminal
    format external hard drive mac using terminal Format external hard drive mac using terminal
    format external hard drive mac using terminal Format external hard drive mac using terminal
    Format external hard drive mac using terminal

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