What's the difference between the MID and DID?

[dbminter]

There's apparently a difference between the Manufacturer ID and the Disc ID.  I put in a blank Verbatim DataLife Plus DVD-R and noticed this:

Pre-recorded Information:
Manufacturer ID: MCC 03RG20

Physical Format Information (Last Recorded):
Disc ID: 0@P-!-00

 

So, what's the difference between the Manufacturer ID and the Disc ID?  I guess the better question is what is the Disc ID?  The Manufacturer ID is obvious. 

[LIGHTNING UK!]

Different formats (and even structures - as per MMC specs) call it different things, that's all.

 

[dbminter]

I wonder why there are different entries on that one disc example I posted.