Related tutorial: How to use Disk Utility to format drives on your Mac. Hope this helps others not waste as much time as I did trying to make this work. Install macOS High Sierra on a Lenovo Y50 - An updated guide to install macOS.
This post has a good overview of how the command's arguments work so you can be sure of what you're getting: This ran successfully and the encryption and partition options became available in Disk Utility. to partition the disk using a GUID partition map (GPT is the argument that specifies GUID) and Journaled HFS+. Step 3) Click Scan, and once the scan is complete, preview. Then I used the following:ĭiskutil partitionDisk /dev/disk2 GPT JHFS+ YourPartitionName 0b Now, connect your Western Digital external hard drive to your MacBook and launch the data recovery software, and from the main interface, select the type of files you want to recover and click Next Step 2) Choose your erased or unreadable WD external hard drive and toggle on Deep Scan. To find out that my new drive was mapped to /dev/disk2. If a drive is not GUID, neither the partition button nor the encryption settings are available in the graphical Disk Utility, which is why we're forced to use the command-line diskutil to partition first. In my case, the problem was that my new drive (La Cie Rugged Thunderbolt from the Apple Store) came with a master boot record partition map and not GUID. I had the same problem (no encryption options, partition button greyed out) and also solved it.
