Absolutely bizarre side-format of DVD-R and BD-R the more you read about it. This bit stuck out to me as especially funny:
With the first-generation DVD M-DISCs, it was difficult to determine which was the writable side of the disc due to being near fully translucent, until coloring and later labels similar to that on standard DVD discs was added to discs to help distinguish the sides preventing user error.
Just a hilarious mistake you should only find in unfinished products.
Actually reminds me of a spindle of CD-Rs I inherited from my uncle that has the same issue - absolutely no label area, it's nearly impossible to tell which side is which. It's made even worse by CDs actually having to write/read data though the polycarbonate disc, so the side that would traditionally be assumed to be the "data" side is actually the underside of the data layer. It's also extremely easy to scrape away the data layer with your fingernail if you're not careful. And I feel like writing with a sharpie directly to the underside of the data layer might be bad in the long term. Just absolutely bizarre CD-Rs. I'll need to post a picture of them later.
