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Question: Issue Causing iMac Pro Not To Boot Into Windows 10 Identified

On December 26, 2017 I received a new iMac Pro and a Promise Pegasus3 R6 raid 5 array. I configured my iMac Pro with a Western Digital My Book thunderbolt 2 hard drive (connected to the iMac Pro using Apple's thunderbolt 2 to thunderbolt 3 adapter), the Pegasus3 R6 connected via a thunderbolt 3 cable which came with the Pegasus3, and two Western Digital USB3 hard drives. I also installed Windows 10 using Bootcamp Assistant. I reported back in January on this Forum that I was unable to boot into Windows 10 on the iMac Pro. When attempting to do so, I would get to the Windows logo screen and the spinning circle of white dots, but the boot would never continue beyond this point.


I have now been able to determine that this problem is directly attributable to the Pegasus3 R6. When it is attached to the iMac Pro, I can never get beyond the Windows 10 logo screen and the spinning circle of white dots. Removing the Pegasus3 R6 from the iMac Pro and it immediately boots into Windows 10 every time without issue. The correct driver for Windows 10 for the Pegaus3 R6 (downloaded directly from the Promise site) is installed and has not solved this issue. Once I have booted into Windows 10 without the Pegasus3 R6 attached) I can then plug in the Pegasus3 R6 and it will function without any problems.


I have been working with Promise Support now for two months to resolve this issue, bu two far no solution form Promise Support has been forthcoming.


Finally, I should point out that I have had access to a second iMac Pro and the exact same issue has occurred upon trying to boot into Windows 10 with the Pegasus3 R6 attached to that iMac Pro.


Tom

iMac Pro, macOS High Sierra (10.13.2), 2 TB flash ram, 64 GB, Vega 64 Pro

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Mar 14, 2018 1:16 PM in response to Loner T In response to Loner T

As you requested:


Last login: Mon Mar 12 22:57:36 on console

Thomass-iMac-Pro-2:~ bengaldad$ diskutil list

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 2.0 TB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 1.5 TB disk0s2

3: Microsoft Basic Data BOOTCAMP 500.8 GB disk0s3


/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +1.5 TB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 221.2 GB disk1s1

2: APFS Volume Preboot 10.3 MB disk1s2

3: APFS Volume Recovery 515.1 MB disk1s3

4: APFS Volume VM 68.7 GB disk1s4


/dev/disk2 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *4.0 TB disk2

1: EFI EFI 209.7 MB disk2s1

2: Microsoft Basic Data Windows 3.0 TB disk2s2

3: Apple_HFS Mac OS Clone 999.9 GB disk2s3


/dev/disk3 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *4.0 TB disk3

1: EFI EFI 209.7 MB disk3s1

2: Apple_HFS WD USB3 3.0 TB disk3s2

3: Apple_HFS Mac OSClone 2 1000.0 GB disk3s3


/dev/disk4 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk4

1: EFI EFI 209.7 MB disk4s1

2: Apple_RAID 3.0 TB disk4s2

3: Apple_Boot Boot OS X 134.2 MB disk4s3


/dev/disk5 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk5

1: EFI EFI 209.7 MB disk5s1

2: Apple_RAID 3.0 TB disk5s2

3: Apple_Boot Boot OS X 134.2 MB disk5s3


/dev/disk6 (external, virtual):

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS My Book Thunderbolt... +6.0 TB disk6


/dev/disk7 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *20.0 TB disk7

1: EFI EFI 209.7 MB disk7s1

2: Apple_HFS Promise Pegasus 20.0 TB disk7s2


Thomass-iMac-Pro-2:~ bengaldad$

Mar 14, 2018 1:16 PM

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Question: Issue Causing iMac Pro Not To Boot Into Windows 10 Identified