Unique DVD disc "serial numbers?"

[dbminter]

Is there such a thing as unique DVD disc "serial numbers" on DVD+RW?  I ask because, if there were, I'd be able to implement a system I wanted to try.  To mark down a disc's unique ID and count the number of times I've written to that unique DVD+RW disc.  I wanted to keep a spreadsheet of how may times I'd written a particular DVD+RW.  It seems to me, unless there is some kind of unique serial number hardcoded onto a disc, my only option is to take a marker and write a unique ID on the top surface.  However, I can't do this unless I stop using cake stacks to store discs and store them in CD cases as the ink could potentially smear/bleed onto the data surface of the disc above it, ruining it for future use.

 

Thanks!