From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Wed, 29 Aug 2007 12:18:51 +0000
Subject: Re: udev naming for PATA drives
Message-Id: <1188389931.3672.34.camel@lov.localdomain>
List-Id: <linux-hotplug.vger.kernel.org>
References: <Pine.LNX.4.64.0708281957160.3018@fbirervta.pbzchgretzou.qr>
In-Reply-To: <Pine.LNX.4.64.0708281957160.3018@fbirervta.pbzchgretzou.qr>
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To: linux-hotplug@vger.kernel.org

On Wed, 2007-08-29 at 14:04 +0200, Jan Engelhardt wrote:
> On Aug 29 2007 07:05, Kay Sievers wrote:
> >
> >> And I also wonder why the ID_MODEL gets truncated by one
> >> character when copies to ID_SERIAL_SHORT. (The 'A' of MK2003GA is missing.)
> >
> >They are unfortunately truncated to 15 chars, which should be 16, yes. 
> >
> >And if you read the native ATA string it has an additional 'H' too,
> >which does not survive the SCSI layer. :)
> 
> Can't the SCSI layer be enhanced? If the (real SCSI) hardware still only does
> 16, well, let it be.


Standard INQUIRY Data Format:
  ...
  |-----+-----------------------------------------------------------------------|
  | 8   | (MSB)                                                                 |
  |- - -+---                        Vendor Identification                    ---|
  | 15  |                                                                 (LSB) |
  |-----+-----------------------------------------------------------------------|
  | 16  | (MSB)                                                                 |
  |- - -+---                        Product Identification                   ---|
  | 31  |                                                                 (LSB) |
  |-----+-----------------------------------------------------------------------|
  ...

> Especially bad is that vendor is always "ATA" with libata
> and the real vendor + model name get squeezed into model name or so.

If vendor is ATA, you can use the native ATA commands (hdparm, ata_id)
and send ATA inquiries over the SCSI device. I think its fine, its just
ATA tunneled through SCSI.

Kay


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