Yes, very interesting, for sure. Lots more space! IBM developed this, if course.
But there are a few nasty problems with it. IBM was looking to make a disk that acually consists of physically segmented bits to counter those. (Published in Nature or Scientific American, IIRC.)
With current harddisks, you format it to "create" the space the bits occupy. But with that recording technology, you actually want the disks to consist of lots of individual rings, that all hold a train of individual bits, separated from one another by a different material.
As far as I know, the current disks use platters that hold no structures. And that means, that you can flip other bits by reading and writing. In other words: while they hold more data, they might "forget" during use.
All IIRC. They might have come up with something that makes those disks work just as reliable as current ones. I just couldn't find any in-depth info about it in a quick Google.
