Only have ONE HDD plugged in when installing Windows!!!1!

0021

Gah! Windows needs to be installed on Disk 0 (i.e. the SSD should be in sata position 0) or else the Windows install puts a random tiny partition on the disk in position 0.

Swap motherboards? Check number of SATA ports.

1355

https://answers.microsoft.com/en-us/windows/forum/all/windows-installed-recovery-partition-on-second/01dde377-a8bb-4b3f-8aeb-8d37bff5898e

A quote from this page seems pertinent:

“It is never a good idea to have more than one drive attached when installing Windows.”

Wise words.

1454

First tried diskpart cleaning the disk with the extra boot segment on; wouldn't let me.

Then plugged boot SSD into Disk 0 (IMPORTANT: marked SATA6G_1 on motherboard). This wouldn't allow booting as it must have confused the whole system.

Looks like we're reïnstalling Windows. Again.

Unplugged the three storage drives and made sure boot SSD was plugged into the ‘first’ SATA position.

1948

Windows 10 IoT installed with all partitions on the boot drive. Now copying backup stuff onto the three storage drives.