Step 1 Open Disk Utility (it is in Applications/Utilities) and click New Image with the device you want to fix selected Step 2 It doesn't matter what you name it but put it on your desktop so you can find it easily. Make sure it is a read/write. Step 3 Find the disk on your desktop and open it.
It should be empty. Step 4 Open Terminal (in the same place as Disk Utility) and type in diskutil list and locate your drive. It should have something similar to the name that shows up in disk utility indented under it (in my example it doesn't) Step 5 We are going to use a Terminal utility called DD to copy the contents bit by bit of the disk image we created to the drive. Make sure you do this right because you can seriously damage your hard drive if you don't. Feel free to ask questions. This is the layout of dd: dd if= of= bs=1m So type dd if= and then drag the drive (the one I named 'Something') into the terminal window.
After that copy the /dev/disk# from the diskutil command of your disk. Make sure it is the right one or you will overwrite your hard drive or other connected drive. Adding onto the dd command type of= and paste the /dev/disk#. Now add bs=1m to that. Now in the dd command you should have something that looks like: dd if=/Volumes/Something of=/dev/disk1 bs=1m This is what it would look like for my example. If everything looks ok then press enter. This can take a long time and will not tell you what is happening until it is done.
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It will just be a blank line in the terminal. When you press enter just let it go until it is done. You will know when it is done because it will tell you something like copied something bytes. Final step Now that you have done that you should be able to go back into disk utility and repartition your dive under the partition tab. If you don't know how to partition it, just click the plus button near the bottom left, name your partition, and make it Mac OS Extended (Journaled) and click apply. Remember if you are unsure, something is different in the steps, or something doesn't work, ask questions!
Accessing Disk Utility RELATED: To access the Disk Utility in macOS, just press Command+Space to open, type “Disk Utility” into the search box, and then press Enter. You can also click the Launchpad icon on your dock, click the Other folder, and then click Disk Utility. Or, open a Finder window, click Applications in the sidebar, double-click the Utilities folder, and then double-click Disk Utility. RELATED: To access the Disk Utility on a modern Mac—regardless of whether it even has an operating system installed—reboot or boot up the Mac and hold Command+R as it boots.
It’ll, and you can click Disk Utility to open it up. In Recovery Mode, macOS runs a special sort of recovery environment. This allows you to use Disk Utility to wipe your entire drive—or repartition it. Partition Drives and Format Partitions Disk Utility shows internal drives and connected external drives (like USB drives), as well as special image files (DMG files) that you can mount and access as drives. On the left side of the window you’ll see all mounted volumes.
RELATED: This annoyingly, but click Views > Show All Devices in the menu bar and you’ll see a tree of drives and their internal partitions. Each “parent” drive is a separate physical drive, while each little drive icon below it is a partition on that drive. To manage your partitions, click a parent drive and select the “Partition” heading. You can adjust the partitioning layout scheme here. You can also resize, delete, create, rename, and reformat partitions. What is the control for paste on a mac. Note: Many of these operations are destructive, so be sure you have backups first.
RELATED: If you want to repartition your system drive, you’ll need to do this from within Recovery Mode, with one exception: APFS volumes., the default on solid state drives as of macOS High Sierra, and it’s got all sorts of clever tricks up its sleeve. One of them: volumes on the same drive pool storage space, meaning you’ll see two separate drives in Finder, but won’t have to manage how much storage space each volume uses. To add a new APFS volume, simply select your system drive, and then click Edit > Add APFS in the menu bar.