Re: [Libcdio-devel] Using major/minor device numbers to determine SCSI or ATAPI

[Steven M. Schultz]

On Thu, 28 Apr 2005, R. Bernstein wrote:

> I don't recall seeing anything on drive endianness or order of bytes
> from audio data. Also, I guess cdparanoia (and libcdio) wants to

        Ok.  

        Hmmm, is the PCM data on music CDs little endian?  Is _that_ defined 
        anywhere?  Perhaps in the CD specifications?

> support a drive whether or not it is MMC capable. One might think that

        "MMC capable".  Perhaps that's the key thing

> in any of the SCSI/MMC specs I'd appreciate learning. It may even be
> that if it's MMC it's defined to be little endian. That's what most of

        Ah ha!  I think you're on to something there.  It might be that MMC
        drives pass the data thru without the byte flipping that some of the
        old proprietary interfaces did.  The SCSI drives I had ages ago were
        MMC compatible and didn't flip the bytes.

> the drives I've enountered have been so far and cdparanoia thinks all
> ATAPI drives are little endian.

        Is it possible/likely that some of that logic in cdparanoia dates
        from the era of proprietary interfaces (i.e. before the MMC standards)?
        If so then is it worth worrying about?  Can't be too many of those
        drives/interfaces still around I'd think.  And the last SCSI drives
        I had (not sure if they're still being made in any great numbers).

        Cheers,
        Steven Schultz