Ok I just try it again fo format in fat32 using the fat32 format tool
The volume is still in GPT
I put a xci file in the root of the hard disk
and another xci file in /sxos/xci/
both xci file are working properly when used from the SD card
It does the same thing scanning forever in a loop and the screen content is flashing on and off forever
I have a really old 80 GB drive and I do the same procedure and it work fine
Only with my big 3 TB drives + that it does this problem
I Try
3 TB WD My Book HDD (externally powered) - does not work
3 TB WD My Book Essential HDD (externally powered) - does not work
80 GB Acomdata HDD - working
64 GB Lexar USB stick - working