16x RW curiosity

I was digging through a stack of older RW discs and came across the one that came with my 48x LiteOn drive. Reading the ATIP in my 52x LiteOn drive:

This Disc is designed for CD-RW/COMBO Drive Only.
Disc Type, Material = HSCD-RW, Phase Change
ATIP Lead-in = 97m 15s 35f
Norminal Capacity = 702.83MB (79m 59s 74f)
Disc Manufacturer maybe = Nanya
SMART-BURN Speed Limit = 16X

Reading in the 48x drive, it shows a 12x speed.
16x??? so I put in Nero, and sure enough I get a 16x speed option.
I was unaware that there were any such discs around.

BTW, its crap media. Burned at 16x it is unreadable. Even at 12x, there are so many errors that it takes a couple minutes for the drive to access it.