Considering the sum of all of my storage devices ...

A black pigment on a bleached mesh of wood fibers. I have quite a lot of useful information in that format.

I have roughly 4TB of on-line storage. If I'm remembering my numbers correctly, that's 468 DVDs, or about 5,300 data CDs. I've got nowhere near that many plastic disks sitting around.

no you don't. Even 1000 books it's a tiny amount of storage in digital form.

Yes, precisely. Despite what audiophiles fervently believe, a CD holds much more data than a vinil record.

Analog data doesn't have infinite precision, at least not in the real world. Any data stream is characterized by a signal to noise ratio [wikipedia.org], which tells you how much of that data is useful information and how much is useless noise.

Vinil records, due to several reasons, have a significantly lower signal to noise ration than CDs, therefore hold less information.

Of course, there might be people who *like* noise, but that has nothing to do with how much information is available. One could synthesize a signal from a CD that sounds exactly like a vinil by adding noise, but you could never get all the information contained in a CD from a vinil record.

To market it to an audiophile, you would describe it differently. You would claim that due to recording details, there's actually more information on the CD than the pure digital data. There are slight variations on the pits which contain those details of the sound which are normally only found only on vinyl. Now standard CD playing technology just ignores that information, but your product is able to access it and thus restore the complete quality of the music, as it is found on vinyl.

Oh, and if you are in CD sales business, too, you should not forget to add that this extra information is, of course, only on the original CDs from the shop, because those are made directly from the recordings. As soon as the music has passed a normal digital readout (as is the case for anything you copy on your computer), that extra information gets lost. Oh, and of course there are CDs which lack this information due to an inferior production process. Most shops ignore that issue, but if they buy the CD at your shop, they can be sure that the extra information is there. Of course the CDs are then a bit more expensive, because checking that the information is really there takes some effort. But if you are a real audiophile, you surely will want to invest that money to be sure you only get the best quality.