The cartridge's advantages
The ROM cartridge was the dominant game storage format for console gaming from the Atari 2600 (1977) through the Nintendo 64 (1996) — nearly twenty years of the mainstream market. Its advantages were concrete: instant loading (no mechanical access time), durability (no moving parts to fail), and simplicity (no file system, no operating system, just code mapped directly into memory addresses). A cartridge game started the moment you powered on the machine. There was no "please wait" screen, no disk access sound, no risk of a corrupted save corrupting the entire game.
The cartridge also offered the hardware extension capability that the NES used so effectively: the cartridge could contain additional chips — mappers, extra RAM, special audio hardware — that supplemented the console's base capabilities. A disk game was limited to what the machine provided; a cartridge game could bring its own hardware. This was a genuine competitive advantage that disk-based systems couldn't replicate.
The disk's advantages
Magnetic disk storage — first cassette tapes, then floppy disks — dominated home computer gaming through the same period when cartridges dominated consoles. The economics were stark: a blank 5.25-inch floppy disk cost pennies to manufacture; a ROM cartridge PCB with a custom chip cost dollars. The difference in production cost translated directly into the economics of game publishing. A disk-based publisher could make more copies of more games at lower risk. A failed cartridge game left publishers with physical unsellable inventory; a failed disk game left them with blank media they could reuse.
Disk storage capacity was also not a constraint in the way cartridge capacity was. Early NES cartridges held 8 to 40 kilobytes of program data. Floppy disks in the mid-1980s held 360 kilobytes. By the late 1980s, double-sided high-density floppies held 1.44 megabytes. Games that needed more data than would fit in a cartridge could use multiple disks. This made possible the text-heavy adventures, the detailed RPGs, the strategy games with large map data — genres that were structurally difficult on cartridges because they needed more storage than was commercially feasible to put in ROM.
Loading time as game design constraint
The single greatest disadvantage of disk-based gaming was loading time. Accessing data from a floppy drive required physical movement of the read head across the disk surface, rotation of the disk to the correct position, and serial reading of the data at the disk's rotational speed. This typically took ten to ninety seconds per load, depending on data size, drive speed, and how well the software managed disk access. For multi-disk games, each disk swap could require ejecting one disk, inserting another, and waiting for the new disk to be read.
This constraint shaped game design in specific ways. Games on floppy-disk platforms tended to have discrete, clearly separated sections — dungeons, levels, areas — where a loading screen could be placed naturally. Games that required fast context switching between large amounts of data were awkward on disk because the disk access would interrupt the play experience. The immediacy of gameplay that cartridge games delivered — the ability to jump from any menu or screen to any other without waiting — was a quality-of-life difference that players felt even if they didn't consciously articulate it.
The CD-ROM transition
The transition to CD-ROM in the early 1990s — driven by the PC CD-ROM drive market and then by consoles from the PC Engine CD-ROM² (1988) through the PlayStation (1994) and Saturn (1994) — combined the high capacity of disk storage with faster access times than floppy drives and the economic efficiency of cheap media production. A CD-ROM could hold 650 megabytes, compared to the few megabytes that high-end cartridges of the period typically contained. The production cost of a pressed CD was a fraction of a ROM cartridge.
The CD-ROM transition enabled specific new types of games: full-motion video sequences (Dragon's Lair had used LaserDisc for this in 1983, but CD made it practical for mainstream releases), full voice acting across long narratives, orchestrated musical soundtracks, and game worlds of a scale that cartridge storage made prohibitive. It also introduced loading times to console gaming for the first time — the PlayStation's loading screens were a step backward in player experience even as they represented a step forward in available content. The trade-off between capacity and access speed that had always existed in storage technology simply moved to a new point on the curve.