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I'm trying to move my Windows 10 Boot Camp partition to an external drive. The ideal way seems to be with Winclone, however I've been unsuccessful so far.

Winclone appears to clone the partition to the external disk successfully and does not report any errors, but upon ⌥-booting, the disk is not shown in the Startup Manager.

Windows 10 is up-to-date and chkdsk has been run on both the Boot Camp partition (disk0s4) prior to cloning and the external disk (disk1s2) post-cloning. The external disk is GUID as Winclone informs me this is required when attempting to clone to an MBR partition scheme.

$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Mac SSD                 150.0 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data Windows                 100.1 GB   disk0s4
/dev/disk1 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:       Microsoft Basic Data Windows                 499.9 GB   disk1s2
$ sudo gpt -r show /dev/disk1
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6         
         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640       2008         
     411648  976355328      2  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  976766976       2015         
  976768991         32         Sec GPT table
  976769023          1         Sec GPT header  
$ sudo fdisk /dev/disk1
Disk: /dev/disk1    geometry: 60801/255/63 [976769024 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 -  976769023] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
$ sudo gpt -r show /dev/disk0
gpt show: /dev/disk0: Suspicious MBR at sector 0
      start       size  index  contents
          0          1         MBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6         
         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640  292968736      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  293378376    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  294647912       1944         
  294649856  195584000      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  490233856        863         
  490234719         32         Sec GPT table
  490234751          1         Sec GPT header
$ sudo fdisk /dev/disk0      
Disk: /dev/disk0    geometry: 30515/255/63 [490234752 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>
 2: AF 1023 254  63 - 1023 254  63 [    409640 -  292968736] HFS+        
 3: AB 1023 254  63 - 1023 254  63 [ 293378376 -    1269536] Darwin Boot 
*4: 0C 1023 254  63 - 1023 254  63 [ 294649856 -  195584000] Win95 FAT32L

How can I make the external disk bootable?

MacBookPro10,1 (Retina, Mid 2012)

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