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Re: multiple problems with usb devices

From: Thomas Schmitt
Subject: Re: multiple problems with usb devices
Date: Sun, 23 May 2010 20:40:49 +0200


> > Is MMC-2 subclass of cardreaders?
> If you are looking for the SCSI command set used by ATAPI CD-ROM or DVD
> devices then you should go to the T10 site and find the MMC or MMC-2

Yes, MMC is the CD/DVD/Blu-ray part of SCSI.
Released is MMC-5 meanwhile. MMC-6 is the current
development version, afaik.
No references to other devices except the general
storage media model for SCSI disks.

The complete command set for CD/DVD/BD is covered
by SPC-3 (for general commands), SBC-2 (for
load/eject) and MMC-5.
They include older specs like MMC-2 but omit
deprecated parts. So for CD it pays off to
also read MMC-1 to MMC-3.

SPC-3 mentions
  SCSI Specification for Optical Card Reader/Writer OCRW [ISO/IEC 14776-381]
but that sounds somewhat exotic. Aren't memory
cards based on electrical memory ?

> Unfortunately you should be a member of T10 to get access to many
> documents, MMC-2 is one of them...

In the past, the development drafts were free
- and mature in their latest versions. The final
standards were published as expensive books
for 200 to 300 dollar per standard.
But now T10 changed policy to 30 dollar per PDF
and no free drafts any more.

On the other hand, there is nothing new on the
market since the last free drafts were published.

Have a nice day :)


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