On September 26, 1887, a German-American immigrant named Emile Berliner filed US Patent 372,786, titled simply "Gramophone." Edison had already patented the phonograph a decade earlier (1877), but Edison's machine recorded sound onto soft tinfoil wrapped around a rotating cylinder, with the needle moving vertically — up and down — to cut the groove. Each recording was a unique physical artifact. You could not mass-produce them.

Berliner's insight looks obvious in hindsight and was revolutionary at the time: record onto a flat disc instead of a cylinder, and have the needle vibrate laterally (side to side) within a groove of constant depth. The flat disc could be used as a master to stamp identical copies in hardened rubber — and later, shellac and vinyl. One performance, infinite reproductions.

This is the patent that created the recorded music industry. Every 78, every LP, every 45 RPM single descends directly from Berliner's 1887 filing. He founded the Berliner Gramophone Company in 1895; his licensee Eldridge Johnson founded the Victor Talking Machine Company in 1901, which eventually became RCA Victor. The "His Master's Voice" dog-and-gramophone trademark? That's Berliner's machine in the painting.

But the modern relevance runs deeper than music. Berliner's patent established three principles that anchor data storage to this day:

• Rotating disc geometry. Spin a flat platter under a read/write head. Hard disk drives, floppies, CDs, DVDs, Blu-ray, and even early laserdiscs all share this topology with the gramophone. The HDD in a data center today is mechanically a Berliner gramophone with a magnetic head instead of a steel needle.
• Mass replication from a master. The stamping process Berliner pioneered — pressing copies from a negative master — is essentially identical to how CDs and DVDs are still manufactured. The pits on a CD are stamped from a glass master in exactly the workflow Berliner invented for shellac.
• Separation of recording and playback hardware. Edison's cylinder system assumed the same machine recorded and played. Berliner's disc separated authoring from consumption — the precondition for an entire industry of distribution.

There's a delicious technical detail in the patent: Berliner originally etched his grooves by recording onto a zinc disc coated in beeswax, then bathing it in chromic acid. The needle would scratch through the wax; the acid would etch the exposed zinc. This is essentially photolithography without the photo — chemical etching to create a physical pattern, the same principle used to manufacture every silicon chip in your phone.

The cylinder-vs-disc format war played out exactly like VHS-vs-Betamax or HD-DVD-vs-Blu-ray nearly a century later. Edison's cylinders had better fidelity for a while. Berliner's discs were cheaper to mass-produce and easier to store on a shelf. By 1912, Edison conceded and switched to discs. The lesson — manufacturability and distribution beat raw performance — has been re-learned in every storage format war since.

Could it be built better now? It already has been, recursively. The 3.5" hard disk in your NAS spins at 7,200 RPM (Berliner's hand-cranked original ran at roughly 70 RPM) and stores 20 terabytes where Berliner stored about two minutes of audio. But the geometry — flat disc, head on an arm, spiral or concentric tracks — is unchanged from patent 372,786.