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    <p>The only way I've been able to find involves a somewhat poorly documented feature of the <code>hfs.util</code>.</p> <p>Run the <code>diskutil</code> command and then copy/remember/save the <code>Device Identifier</code>:</p> <pre><code>diskutil info /Volumes/my_drive_label | grep "Device Identifier" </code></pre> <p>You can use the <code>hfs.util</code> with the <code>Device Identifier</code> (replacing <code>disk2s1</code> below) from <code>diskutil</code> to (re)generate a UUID for your volume:</p> <pre><code>/System/Library/Filesystems/hfs.fs/hfs.util -s disk2s1 </code></pre> <p>Keep in mind this won't work for every volume, if the volume is not an HFS drive than it may not work, and other <code>Filesystem/*.fs/*.util</code> commands may not have a <code>-s</code> verb to generate UUIDs.</p> <p><strong>UPDATE</strong></p> <p>In Yosemite and after the <code>-s</code> flag has been disabled at the source level. I haven't been able to find a pre-modified version of <code>hfs.util</code>, but you can do it yourself using the information found in <a href="https://superuser.com/questions/344706/how-does-one-change-the-uuid-of-a-volume-on-mac-os-x-to-a-specified-value">this Superuser question</a>, summarized here:</p> <ol> <li>Download the hfs.util source <a href="https://opensource.apple.com/source/hfs/hfs-183.1/hfs_util/" rel="nofollow">from Apple</a> and extract it to a temporary folder</li> <li>Download hfs_fsctl.h <a href="https://opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/hfs/hfs_fsctl.h" rel="nofollow">from Apple</a> and put it in the hfs.util folder</li> <li>Change line <strong>47</strong> of <code>hfsutil_jnl.c</code> into <code>#include &lt;hfs_fsctl.h&gt;</code></li> <li>Change line <strong>80</strong> of <code>hfsutil_main.c</code> into <code>#include &lt;System/uuid/uuid.h&gt;</code> </li> <li>Change line <strong>81</strong> of <code>hfsutil_main.c</code> into <code>static unsigned char kFSUUIDNamespaceSHA1[] = {0xB3,0xE2,0x0F,0x39,0xF2,0x92,0x11,0xD6,0x97,0xA4,0x00,0x30,0x65,0x43,0xEC,0xAC};</code> (replacing the include line)</li> <li>Also add <code>#define HFS_UUID_SUPPORT 1</code> to <code>hfsutil_main.c</code> </li> </ol> <p>There might still be something missing in the argument parsing section if the above doesn't work, please reference the Superuser question and comment if I've missed something.</p> <p>Some people have also reported that it may be possible to use <a href="http://gparted.org/" rel="nofollow">Gparted</a> to change the UUID of a drive.</p>
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    1. PONot getting UUID from diskutil on OSX
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    1. USAnthony Michael Cook
    1. USAnthony Michael Cook
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