hi Jim,

the ID emitted by the destinatininfo verb is not a volume UUID. it's a unique 
identifier used by Time Machine to track a collection of information about a 
specific backup destination. (we refer to it as the "destination ID".) the ID 
is used with other verbs like removedestination:

        sudo tmutil removedestination <destination_id>

what's your higher-level goal? for most "i need to ignore TM stuff" situations, 
it's sufficient (and most-correct) to ignore the Backups.backupdb directory at 
the root of any volume. (for example, a disk with a TM backup store could be 
connected to a machine but not be one of that machine's backup disks.)


--
michael
formerly time machine


On 20 Jul, 2016, at 10:03, Jim O'Connor <jocon...@orderndev.com> wrote:

> On El Cap (10.11.5) when I do 
> 
>       tmutil destinationinfo -X
> 
> I get a uuid which doesn’t match anything in
> 
>       diskutil info devnode
> 
> 
> Where do I look to get the same UUID that Time Machine is using? I need to 
> avoid the media that the OS is using for Time Machine.
> 
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" 
> "http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
> <plist version="1.0">
> <dict>
>       <key>Destinations</key>
>       <array>
>               <dict>
>                       <key>Kind</key>
>                       <string>Local</string>
>                       <key>ID</key>
>                       <string>EEDAB9D5-740E-4E11-BC39-52A4B6E58638</string>
>                       <key>Name</key>
>                       <string>TimeMachineHD</string>
>                       <key>LastDestination</key>
>                       <integer>1</integer>
>                       <key>MountPoint</key>
>                       <string>/Volumes/TimeMachineHD</string>
>               </dict>
>       </array>
> </dict>
> </plist>
> 
> 
>    Device Identifier:        disk2s2
>    Device Node:              /dev/disk2s2
>    Whole:                    No
>    Part of Whole:            disk2
>    Device / Media Name:      TimeMachineHD
> 
>    Volume Name:              TimeMachineHD
> 
>    Mounted:                  Yes
>    Mount Point:              /Volumes/TimeMachineHD
> 
>    File System Personality:  Journaled HFS+
>    Type (Bundle):            hfs
>    Name (User Visible):      Mac OS Extended (Journaled)
>    Journal:                  Journal size 155648 KB at offset 0x3a38000
>    Owners:                   Enabled
> 
>    Partition Type:           Apple_HFS
>    OS Can Be Installed:      Yes
>    Media Type:               Generic
>    Protocol:                 USB
>    SMART Status:             Not Supported
>    Volume UUID:              5A69DD5E-D6B9-31B7-8CD6-FC377EBC5F18
>    Disk / Partition UUID:    620E6E7B-7C47-4930-B5F7-5C7E68C3B025
> 
>    Total Size:               2.0 TB (2000054960128 Bytes) (exactly 3906357344 
> 512-Byte-Units)
>    Volume Free Space:        2.0 TB (1993384857600 Bytes) (exactly 3893329800 
> 512-Byte-Units)
>    Device Block Size:        512 Bytes
>    Allocation Block Size:    4096 Bytes
> 
>    Read-Only Media:          No
>    Read-Only Volume:         No
> 
>    Device Location:          External
>    Removable Media:          No
> 
> 
> Thanks for looking.
> 
> Jim
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