MMC-4 Media Serial Number proposal
Oribe at iomega.com
Thu Sep 18 14:23:00 PDT 2003
* From the T10 Reflector (t10 at t10.org), posted by:
* "Hiromichi Oribe" <Oribe at iomega.com>
I received some emails asking "Isn't the media serial number command
already defined in SPC document?" So I would like to clarify my
First of all, READ MEDIA SERIAL NUMBER command is already defined in
I don't think there is anything stopping MMC-4 device to use the READ
MEDIA SERIAL NUMBER command; however, I didn't see a way in the MMC-4
spec to tell the host whether the drive is "capable" of reporting the
media serial number of the currently mounted media.
In other word, how would the host know if the device "supports" the
media serial number reporting or not?
My proposal 1 is to provide a way to tell say in the Features that the
drive is capable of reporting the media serial number via READ MEDIA
SERIAL NUMBER command.
My proposal 2 is a way to provide a media serial number in the same way
MMC-4 device can provide logical unit serial number in the Feature
I'm not sure if anyone likes proposal 2 since the command is already
defined in SPC-3. Though a method to report a unit serial number is
already defined in SPC document (VPD page of INQUIRY command), MMC
devices use a different method to report a logical unit serial number
using one of Feature descriptors. If MMC-4 wants to apply the same rule
for the media serial number, proposal 2 is a way to do it.
From: jim [mailto:jwstephens at msm.umr.edu]
Sent: Wednesday, September 17, 2003 8:37 PM
To: Hiromichi Oribe; t10 at t10.org
Subject: Re: MMC-4 Media Serial Number proposal
If you wish to have a useful serial number, I would allow the following:
a clear text serial number.
an option for a digital signature containing the serialnumber, and a
the originator of the serial number, such that the resulting string can
if desired for the veracity of the signature, and comparison to the
Otherwise one would only have to scan a program for the application of
command (which must be public) going to the driver, and substitute in
serial number desired, (such as one which would allow access to data via
(I am not associated with any current T10 member, just an observer of
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org
More information about the T10