USB Mass storage sub-class for MMC devices

jgeldman at lexar.com jgeldman at lexar.com
Thu Sep 20 17:24:19 PDT 2007


* From the T10 Reflector (t10 at t10.org), posted by:
* <jgeldman at lexar.com>
*
This is a valid alternative. However, if you favor it, I would like to
understand why. 
As Katata-san suggested in the meeting, OS's are likely to continue to
support devices they already support.
Is there perphaps some advantage in having devices & OS's continue to declare
identical functionality in two mass storage subclasses?  
Thanks, 
John Geldman
Lexar Media
47300 Bayside Parkway
Fremont, CA 94538
P: 510 580-8715
C: 510 449-3597
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Curtis
Stevens
Sent: Thursday, September 20, 2007 4:16 PM
To: Bill McFerrin; t10 at t10.org; Mt.Fuji
Subject: RE: USB Mass storage sub-class for MMC devices
* From the T10 Reflector (t10 at t10.org), posted by:
* "Curtis Stevens" <curtis.stevens at wdc.com>
*
An alternative would be to change subclass 02h to say MMC-2 and above...
-------------------------------------------------
Curtis E. Stevens
20511 Lake Forest Drive #C-214D
Lake Forest, California 92630
Phone: 949-672-7933
Cell: 949-307-5050
E-Mail: Curtis.Stevens at WDC.com
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Bill McFerrin
Sent: Thursday, September 20, 2007 2:15 PM
To: t10 at t10.org; Mt.Fuji
Subject: USB Mass storage sub-class for MMC devices
* From the T10 Reflector (t10 at t10.org), posted by:
* Bill McFerrin <billmc37 at ctesc.net>
*
Members:
Curtis Stevens (Western Digital) came to our MMC WG meeting on 19 September
2007 to bring up a concern about UBC mass storage bridge implementations.
The drive sub-class may be specified as either
SFF8020/MMC-2 (value = 2) or Transparent SCSI (value=6). Since SFF8020 is
obsolete and MMC-2 has been withdrawn as a standard, we should act to promote
the use of only drive sub-type 6. Keiji Katata (Pioneer) proposed that drive
sub-type 2 be made obsolete. If you are aware of common use of drive sub-type
2, please respond to this message.
Kind Regards,
Bill McFerrin
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