linux-kernel - Re: Which disk is ata4?

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Date:	Thu, 30 Aug 2012 17:39:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Jan Engelhardt <jengelh@...i.de>,
	Andy Lutomirski <luto@...capital.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Bjoern Franke <bjo@...d-west.org>,
	Tim Nufire <linux_ide_tim@...nk.com>
Subject: Re: Which disk is ata4?

On Thu, 30 Aug 2012 18:29:38 +0200
Borislav Petkov <bp@...en8.de> wrote:

> On Thu, Aug 30, 2012 at 06:14:46PM +0200, Jan Engelhardt wrote:
> > This tells me everything to replace a disk.
> > 1. sdparm -C stop /dev/sdb
> > 2. Removing Z1F0KR3H from the chassis.
> 
> Yep, the serial number is the best suggestion so far.
> 
> Are we sure this serial number is always programmed in by the hdd
> vendors so that sdparm can read it out?

With three known exceptions
- fake ones generated by some IT821X adapters in RAID mode
- certain old Maxtor PATA drives had a peculiar firmware failure where
  they changed to some kind of default serial number. Very unusual. Was
  never really fully explained and seems to have been very rare.
- drives so ancient they don't support IDENTIFY, and we don't support
  them in libata anyway !

Alan
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