Hello,
Whats the brand and version of the disk? Please check the compatibility from the vendors site. If need, you may need to update the firmware of the disk.
Thanks,No
The disks can be seen fine in Windows 7
The disks can be seen fine in Windows 7
Intriguing... tell us more
What is the boot device? Are these drives always secondary to an existing boot disk?
How are the drive connected (SATA, USB, SCSI, etc)
these drives were a existing 8.1 boot system
they were moved to an existing 8.1 system or a win 7 system
All partitions can be seen Ok in the win 7 system but not in the win 8.1 system
connected via sata
all the drives are seen in the bios
it does not make a difference if uefi is enabled ir not
the disks can bee seen in win 7 ok
these drives were a existing 8.1 boot system
the disks were a win 8.1 system & were moved to secondary drives to migrate data
no firmware update available or required to see the disk in a win 7 system ok
All partitions can be seen Ok in the win 7 system but not in the win 8.1 systemconnected via sata
all the drives are seen in the bios
it does not make a difference if uefi is enabled ir not
So, the Win8.1 system boots up fine... but doesn't see the secondary disk as active volumes.
I would expect that the "Disk Management" tool would see all disk devices, even if they didn't have active volumes. It should appear at the bottom part... not necessarily at the top part (where the active volumes are). Can you re-verify that Disk Management can't see the physical drives?
If that does work, then try the DiskExt command line tool from SysInternals