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nobusFlag for Belgium

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usb2 problem - pc or stick ?

i have a problem with an usb2 512Mb stick

when windows is running - the stick is recognised asap, and i can R/W to it

However - when the stick is connected during boot - the pc is blocked, and does not respond to any input. if the stick is removed after a short time  - 20-30 sec; it boots normally - but it boots ok on another pc, and other usb 2 sticks work fine on this pc too

so i want to gather more info on this behaviour. and am looking for methods or softwares to test /diagnose or gather info of the usb stick

i know aboutt usbDevieuw


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Seth Simmons
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so i want to gather more info on this behaviour.

first thing that comes to mind is secureboot
i have seen some tools used to build a bootable usb flash that either don't support or don't work well with secureboot
if it is enabled, disable it and try to boot from it; enable it again later
It's not the stick, it's most probably your BIOS/UEFI taking time in scanning and trying to get the stick to boot.
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☠ MASQ ☠

Yes, the two commonest causes are that the PC can't resolve the device identity before the Windows PE launches and/or the stick is pulling more current than the hub is delivering.  Both these resolve after boot in Windows.
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ASKER

that sounds ok - but why do i have this problem on only 1 PC ? and only with this stick ?i would acceept the suggestions - if it happens on all - pc's and sticks
Could there be some boot related info on the stick? Did you try erasing it fully?
i agree with Gerwin Jansen... Likely there is some left over boot info in the USB drives partition info...Enough for your bios to hand over the boot, but not enough to actually start...
what is the boot priority set in the system? remove or move down USB this is in your bios toot settings
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ASKER

gerwin - yes reformatted it - and remember it works on another PC
David >>  what is the boot priority set in the system?  how would i know when it locks up the bios when connected?
all i can say is that the system boots ok from other usb 2 and 3 sticks

that is why i was asking for methods/ soft to gather more info
"that sounds ok - but why do i have this problem on only 1 PC ? and only with this stick ?i would acceept the suggestions - if it happens on all - pc's and sticks"    

It's that specific hardware combination (although if it's an amperage issue it could also be that the PC's hub is under delivering rather than the stick over-asking for current)

This used to be more common with older BIOSes but is gradually disappearing as an issue with UEFI

http://www.pchell.com/hardware/usb_drive_stops_computer_from_booting.shtml                         
>> yes reformatted it - and remember it works on another PC
I know it works on another PC - that's why I suggested to fully erase it, I assumed you already formatted it.

Maybe it's worth a try to erase it with SDFormatter or Diskutil:

https://www.pendrivelinux.com/restoring-your-usb-key-partition/
it boots ok on another pc

Are the two PC's similar?  (Same make/model etc) ?

other usb 2 sticks work fine on this pc

Are they the same brand as the stick that is having issues on this PC?
first thing that comes to mind is secureboot

@Seth Simmons

Agreed however other sticks boot just fine.

I'm currently assuming the sticks are all created the same (same software, images etc)

To me this sounds like a issue between that stick and the hardware on the PC.

I had a laptop that wouldn't boot off of certain Kingston sticks, yet they booted fine elsewhere
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ASKER

i have 4 Asus pc's and tested the boot problem on each one

the boards  P8H61 and P8B75-M do boot ok
the boards z170M-plus and H97M-plus lock up
so it seems the older generation has no problem, the newer  ones have it

@Masq i doubt a 512 Mb stick causes an overcurrent problem
"Masq i doubt a 512 Mb stick causes an overcurrent problem"

Nor me, I'm simply giving possibilities why these combinations are giving the results you're seeing.  It's much more likely the BIOS is failing to resolve the device ID outside of Windows and there's no IRQ made available.

You're managing the actual diagnostics so we now know there are specific combinations of hardware that produce the issue. It's interesting that it's the newer boards, not what I was expecting. Do they have Legacy USB support?




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sur they have it set - and other sticks  (with and without uefi) boot normally
i'm planning to contact Asus - if i get no more info here
Any differences between the sticks that work and the sticks that don't?

Brand, model, size etc?
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ASKER

the 512MB is usb 2 generic p/nU2MP4 series
i tested with 2 Gb usb2 sticks, 8 gb usb2 and usb 3 sticks -  all work fine
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nobus
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