Re: Unusable system during dd to USB block device

[Reinoud Zandijk <reinoud%NetBSD.org@localhost>]

On Tue, Dec 29, 2020 at 10:02:44AM +0000, Thomas Mueller wrote:
> > On Tue, 29 Dec 2020, Thomas Mueller wrote:
> > > I tried to dd to /dev/sd2 (or whatever the number was), and it looked
> > > good on the screen, no error message, but nothing happened on the USB stick.
> 
> > 3 possibilities here:
> 
> > a) You wrote to the wrong device.
> > b) You now have a copy of the input file in /dev
> > c) _Very_ exotic HW issue. (You write to the device; the device says "write OK"
> >     but, it doesn't actually write anything. I've known this to happen on some
> >     models of eMMC/SDHC cards.)

I suspect b) :) happened to me before too. Just check your /dev with `ls
-altr' it should show up easily.

As for the device name, `dmesg | tail` will tell what drive was added and then
use the raw partion like /dev/rsd2 or similar.

Reinoud