![Encryption Won Encryption Won](/uploads/1/2/5/5/125540531/175511499.jpg)
I had the same problem (no encryption options, partition button greyed out) and also solved it. 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. 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 the Terminal app, I used: diskutil list to find out that my new drive was mapped to /dev/disk2. Then I used the following: diskutil partitionDisk /dev/disk2 GPT JHFS+ YourPartitionName 0b.to partition the disk using a GUID partition map (GPT is the argument that specifies GUID) and Journaled HFS+. This ran successfully and the encryption and partition options became available in Disk Utility.
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This post has a good overview of how the command's arguments work so you can be sure of what you're getting: Hope this helps others not waste as much time as I did trying to make this work. Ok, that didn’t work. Here is what did and finally got Disk Utility to give me the encryption option using this command in Terminal first: “diskutil list” to get a list of the mounted disks (I only had my one internal drive, which is in just one partition). Thus, the external drive I wanted to reformat/erase was the third in the list and indicated by “disk 2”. Then, I used this command where I “Silver” was the name I wanted to name the new formatted disk: “diskutil eraseDisk JHFS+ Silver disk2' After doing all that, I then used the regular Disk Utility application to “Erase” the disk and selected the encrypted option.
![Drive Drive](http://blog.fosketts.net/wp-content/uploads/2015/07/Screen-Shot-2015-07-20-at-3.30.38-PM.png)
Hope this helps! (I found part of my solution from this site: ). I had the same problem (no encryption options, partition button greyed out) and also solved it. 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. 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 the Terminal app, I used: diskutil list to find out that my new drive was mapped to /dev/disk2.
Then I used the following: diskutil partitionDisk /dev/disk2 GPT JHFS+ YourPartitionName 0b.to partition the disk using a GUID partition map (GPT is the argument that specifies GUID) and Journaled HFS+. This ran successfully and the encryption and partition options became available in Disk Utility.
This post has a good overview of how the command's arguments work so you can be sure of what you're getting: Hope this helps others not waste as much time as I did trying to make this work. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the.