No way to edit the OP? Title should be updated to "

Rebooting to Boot Camp (W7) leaves me stuck at Apple Logo after upgrading to El Capitan

Anyway. I could've sworn that the boot camp drive was disk0 prior to upgrading to El Capitan. It is seated in the SATA0 slot on my Apricorn Velocity Solo X2, as it was instrumental in getting Windows to load and install on a separate drive.

Could they have been switched "logically" when I upgraded to El Cap?

I tried switching the SSDs physically, moving the W7 drive from SATA0 to SATA1. When I booted again, the machine hung at the apple logo, as if it was trying to boot with the Windows SSD, even though I was in OS X when I shut down.

I rebooted, held down ALT, selected to launch OS X, and now I have this diskutil list:

Kristians-Mac-Pro:~ Kristian$ diskutil list

/dev/disk0 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:     FDisk_partition_scheme                        *250.1 GB   disk0

   1:               Windows_NTFS BOOTCAMP                250.1 GB   disk0s1

/dev/disk1 (external, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *1.0 TB     disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:                  Apple_HFS Macintosh SSD 1TB       999.2 GB   disk1s2

   3:                 Apple_Boot Recovery HD             784.2 MB   disk1s3

Kristians-Mac-Pro:~ Kristian$ sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=250059350016; sectorsize=512; blocks=488397168

gpt show: /dev/disk0: MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 488397167

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34       2014        

       2048  488392704      1  MBR part 7

  488394752       2383        

  488397135         32         Sec GPT table

  488397167          1         Sec GPT header

Kristians-Mac-Pro:~ Kristian$ sudo gpt -vv -r show /dev/disk1

gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: Sec GPT at sector 1953525167

       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  1951583808      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  1951993448     1531680      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  1953525128           7        

  1953525135          32         Sec GPT table

  1953525167           1         Sec GPT header

Kristians-Mac-Pro:~ Kristian$

1. They are external in the way that they are on the PCI-e bus, rather than SATA.

2. Yes, I'll give it a shot.

Moving the Bootcamp SSD to the internal sata0 allowee me to boot into windows.

But I'd still like to have it on my Apricorn PCI-e adapter, if only for the performance gains.

Haven't forgotten about this, just been busy.

Will try it tomorrow. Thanks again for your help with getting me into Windows at least!