Re: System hangs when using USB 3.0 HD with on Ubuntu

Alan Stern
2010-03-26T21:10:59Z

On Fri, 26 Mar 2010, Sarah Sharp wrote:

> I think the amount of information is fine, but I'm not sure why the
> device would respond with a stall to this particular command, so I'm
> CC'ing the USB storage list and SCSI list. Does anyone know what the
> third command is? The USB storage driver reports it as an "unknown
> command". I can see from scsi.h that 0x85 is the code for ATA_16, but
> I'm not sure what that command actually does.

I have never heard of any kernel driver issuing either the BLANK
command or an ATA_16 pass-through command. It almost certainly is a
user program doing this, but I don't know which one.

Booting into a minimal userspace environment (for example, with
init=/bin/bash) might prove this.

No doubt the reason the drive fails to respond is because it can't
handle these commands and gets fatally confused.

Alan Stern

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