Multi-disc albums are counted once for each disc within the album if it is over 100 minutes in length or is from the vinyl era. For example, each copy of
The Smashing Pumpkins's
Mellon Collie and the Infinite Sadness (running time of 121:39),
OutKast's
Speakerboxxx/The Love Below (running time of 134:56), and
Shania Twain's
Up! (145:44), all
double albums, were counted twice, meaning each album was certified diamond after 5 million copies were shipped.
Pink Floyd's
The Wall and
The Beatles'
White Album, both vinyl-era, are also counted double even though their running times are under the minimum requirement