External HDD's Causing Mini Pc to not Boot

[Crampo09]

Hi,

I have a prodesk 400 G9 Desktop Mini, and a terramaster 5 bay external hdd caddy (d5-300c)

I had a prodesk 400 G5 and everything worked fine.

So basically here's the issue:

When i power on the PC or Restart the PC, the external HDD gets a signal to wake, and it gets this before the PC Posts.

So Its causing the PC to never POST, theres nothing on screen. its just a black screen. 

If i power down/remove the usb Cable. Power on the PC / Restart it, and then say 5 seconds after, plug in the USB/Power on. The PC will Post and all is good. 

This only seems to be an issue on the G9, on the G5 it was ok. 

What ive done so far

> reset all bios settings to default

> tried another G9 

> tried a G5 - works

> removed all the drives from the caddy and tested  1 by 1, still the same

> changed Usb to keyboard/mouse only - which worked, but then no HDD's were available in win11

Is there some setting im missing in Win 11 or the Bios?

Thanks in advance.

[DGroves]

different computers vary on exactly how they scan for attached devices before continuing the boot

on some systems using a external drive box with "JBOD" drives (just a bunch of disks) the boot computer will stop and query the ext drive box controller then query each installed drive in the box before continuing on this procedure results in excessive delay sometimes 3-5 min before continuing the boot! for these systems the easiest solution is to leave the ext drive box powered off until the main system finishes detecting the installed drives then power on the ext drive box

i have a retail Asus motherboard with a ext 5 bay drive box that has this issue, and the same ext box does not cause a boot delay on my HP z820 but does on my HP z240

the boot delay is not a bug, but rather how the bios engineers decided to scan for attached storage