I'm perplexed at what "AIP Advances" is supposed to be. This paper isn't an advance of any sort. It's an application of some decades-old formulas you can grab off Wikipedia; a high schooler could apply them to get this result. It adds nothing to "testability" (and is in fact wrong in its understanding of what "information" in a hard drive really is).

The journal has an impact factor of 1.5. For comparison, Science and Nature are in the 40s. This was a cute letter, but it should not have passed peer-review, whether it's open-access or not, because it contributes nothing novel.