So this is WAY old and probably of little use to anyone anymore, but I just ran into this same issue and was able to resolve it. I get the "box" error any time I tried adding the usb devices after boot. It says you can add them, then wait 5 minutes and press enter. If I add them during that time I get the "box" error. If I boot the computer with all devices already attached then I don't.
Reproduced it on 2 different machines using 3 different connections (directly connected to hard drive, and then two different sata to usb brands). I also reproduced the error whether it was SSD or HHD. This was the only variable. Make sure all devices are already attached when booting if you're getting this error.
Reproduced and solved!! (for me anyway...)
So this is WAY old and probably of little use to anyone anymore, but I just ran into this same issue and was able to resolve it. I get the "box" error any time I tried adding the usb devices after boot. It says you can add them, then wait 5 minutes and press enter. If I add them during that time I get the "box" error. If I boot the computer with all devices already attached then I don't.
Reproduced it on 2 different machines using 3 different connections (directly connected to hard drive, and then two different sata to usb brands). I also reproduced the error whether it was SSD or HHD. This was the only variable. Make sure all devices are already attached when booting if you're getting this error.