I'm having a similar problem on mac. I just keep getting "FAIL: There appears to a drive present with the label UNRAID

but it's not installed on the first partition"

I've included a screenshot and any help would be amazing.

 

William

Please (re)attach your unRAID flash back up to you Mac, open Terminal, run 'diskutil list' and copy the output from that command here so I can review.

Facing the same issue..

/dev/disk0 (internal, physical):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:      GUID_partition_scheme                        *500.3 GB  disk0

  1:                        EFI EFI                    209.7 MB  disk0s1

  2:          Apple_CoreStorage Macintosh HD            499.4 GB  disk0s2

  3:                Apple_Boot Recovery HD            650.1 MB  disk0s3

 

/dev/disk1 (internal, virtual):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:                            Macintosh HD          +499.1 GB  disk1

                                Logical Volume on disk0s2

                                D418545C-099C-4C74-8A33-427978F51DC6

                                Unlocked Encrypted

 

/dev/disk2 (external, physical):

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:      GUID_partition_scheme                        *15.8 GB    disk2

  1:                        EFI EFI                    209.7 MB  disk2s1

  2:      Microsoft Basic Data UNRAID                  15.6 GB    disk2s2

 

 

You need to recreate the partition table for the USB drive to MBR, not GPT. You'll also lose all the data on the drive in the process, so you'll have to copy the archive contents over again.

Thanks kode54.. New to mac here.. I have no clue between them..

From what I can tell, Disk Utility will not re-format some USB drives so that you can set the partition table to MBR. Offhand I don't know what the issue is but it's pretty explicit about it when you click Partition.

 

I had to try another USB drive and that one allowed me to switch from Guid Partition Map to MBR when using the Erase command.

 

Just wanted to post this so if you're failing to get the right option, you don't keep scratching your head - try another USB drive. I'm on Sierra so I have the latest DU. I don't know if possibly a third-party disk tool could get around this those "locked down" USB drives.