Hi Michael,

Thanks for your response.

My higher level goal is to recognize partitions that TM will actively try to 
use on so I can avoid them. Media with TM data not related to this machine need 
different handling. I need to be sure I don’t interfere with TM in any way.

I don’t believe using the partition name alone will be sufficient.

Thanks,
Jim

On Jul 20, 2016, at 10:37 AM, Michael Watson <michael_wat...@apple.com> wrote:

> 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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> 
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