In the 1970s, would it have been possible to make 8 inch floppy drives, as cheap as 5.25 inch floppy drives, if you knew in advance that you could count on volume ramping up to millions of units?

Sonar Pro

Vote: No

The search results indicate that 8-inch floppy drives were significantly more expensive than 5.25-inch drives even as production scaled up. In 1976, the Shugart SA-400 5.25-inch drive sold for $400[4], while 8-inch drives cost substantially more—around $300 each in mid-1970s dollars[5], and were often more expensive than the computers themselves[4]. Most critically, An Wang specifically requested a 5.25-inch alternative because he wanted a drive costing around $100, implying the 8-inch drives were far more expensive[4]. The fundamental issue was likely inherent design complexity and manufacturing constraints of the larger format. By 1978, ten different manufacturers were producing 5.25-inch drives[4], indicating rapid market adoption and economies of scale, yet 8-inch drives remained the more expensive format. The price differential persisted not due to lack of volume potential, but because of the physical and engineering characteristics of the larger drive—more complex mechanics, larger components, and higher precision requirements. Even with advance knowledge of millions of units in demand, these inherent manufacturing costs couldn't be engineered away to match the smaller, simpler 5.25-inch design.

GPT-5.4

Vote: No

Even with foreknowledge of million-unit volumes, an 8-inch drive has a higher irreducible material and mechanical cost than a 5.25-inch drive. The larger disk requires a bigger spindle, larger enclosure, larger head-positioning travel, stiffer frame, more powerful motor, and more material in the media and jacket. Those are first-order physical size penalties, not just low-volume inefficiencies. High volume helps amortize tooling, engineering, and factory overhead, and it can reduce part prices. But it does not eliminate the cost difference created by scale. A smaller precision electromechanical device is generally cheaper once both are mass-produced to similar standards. The historical price gap was not only because 5.25-inch was newer or had better luck with volume; it was also because it was deliberately designed as a smaller, lower-cost format for microcomputers. Volume could narrow the gap, but not plausibly make 8-inch drives as cheap as 5.25-inch drives in the 1970s.

Grok 4.1 Fast

Vote: No

8-inch floppy drives are physically larger than 5.25-inch drives, requiring more materials for enclosures, disks, hubs, and mechanisms. The disk area is ~2.3x larger ((8/5.25)^2), increasing material costs for media, jackets, and components like larger spindle motors and stepper actuators to handle greater inertia and track lengths. Even with foreknowledge of millions of units, economies of scale amortize fixed design costs but cannot eliminate higher variable material and manufacturing costs inherent to the larger form factor. Historical 5.25-inch drives benefited from miniaturization trends and PC volume, dropping to ~$50-100 wholesale; 8-inch drives stayed $300+ even in moderate volumes due to size. Redesign for volume (e.g., plastic enclosures, automated assembly) helps, but physics sets a cost floor ~1.5-2x higher than smaller drives, as seen in analogous tech like larger HDDs or tape drives costing more per unit despite scale.

Claude Opus 4.6

Vote: No

No, even with guaranteed high volume, 8-inch floppy drives would have remained more expensive than 5.25-inch drives for fundamental physical and engineering reasons. First, the 8-inch drive mechanism is physically larger, requiring more material — more sheet metal or plastic for the chassis, a larger spindle motor, longer head positioning mechanisms, and larger circuit boards. These are not costs that disappear with volume; they are intrinsic material costs. A larger drive simply uses more stuff. Second, the 8-inch floppy disk media itself is larger, requiring more magnetic coating material and a bigger jacket. At scale, the per-unit media cost difference becomes a persistent factor. Third, the 5.25-inch drive was specifically designed from the ground up as a cost-reduced, simplified product for the emerging personal computer market. Shugart Associates (and later many clones) engineered the 5.25-inch drive with fewer components, simpler mechanics, and cheaper construction techniques. The 8-inch drive carried legacy design complexity from its origins as a higher-end data processing peripheral. You could simplify an 8-inch drive somewhat, but you can't escape the physics of needing a bigger mechanism. Fourth, volume manufacturing economics have diminishing returns. Once you're at millions of units, the dominant costs shift from tooling amortization and overhead to per-unit materials, labor, and components. At that scale, the physically larger 8-inch drive's material cost disadvantage becomes the binding constraint, not economies of scale. While guaranteed volume would certainly bring 8-inch drive costs down significantly, it would bring 5.25-inch drive costs down by a comparable or greater percentage from an already lower baseline. The cost gap would narrow but not close.

Gemini 3.1 Pro

Vote: No

Even with economies of scale reaching millions of units, an 8-inch floppy drive could never be made as cheaply as a 5.25-inch drive. At massive production volumes, fixed costs (such as R&D, engineering, and factory tooling) are amortized to near zero per unit, meaning the final price is overwhelmingly dictated by the Bill of Materials (BOM) and shipping costs. An 8-inch drive requires significantly more raw materials—more stamped metal for the chassis, more plastic for the bezels, and longer rails. Additionally, an 8-inch floppy disk has substantially more mass and rotational inertia than a 5.25-inch disk. This necessitates a larger, more powerful, and more expensive motor to spin the media, which in turn requires a larger and more expensive power supply. Because the same economies of scale would equally apply to 5.25-inch drives, the smaller format would ride the exact same cost curve downwards. The inherent physical requirements of the 8-inch drive guarantee that its baseline material and component costs will always remain higher than those of the physically smaller 5.25-inch drive.

Kimi K2.5

Vote: No

Even with guaranteed millions of units, 8-inch drives could not have matched 5.25-inch drive costs due to fundamental physical constraints that volume cannot eliminate. First, material costs scale directly with size. An 8-inch disk has roughly 2.3x the surface area of a 5.25-inch disk, requiring proportionally more magnetic coating, plastic substrate, and protective jacket material. The drive chassis, head actuator assembly, and spindle motor must also be larger and more robust to handle greater mass and inertia. These material and component differences represent a fixed cost floor that manufacturing efficiency cannot overcome—steel, aluminum, and magnetic media cost what they cost regardless of how many units you produce. Second, the 5.25-inch format was specifically engineered to exploit miniaturization cost advantages beyond mere economies of scale. Smaller drives require less power, generate less heat, fit into standard desktop enclosures, and cost less to ship and package. These logistical and engineering benefits compound with volume but are inherent to the smaller form factor. Finally, historical evidence supports this: 8-inch drives remained premium products even when produced in substantial volumes for the business market, while 5.25-inch drives achieved price points suitable for mass consumer markets that 8-inch technology could never reach.

Final Summary

The AI Roundtable reached a rare unanimous consensus, with all six models flatly rejecting the idea that volume alone could close the price gap. Led by Claude Opus 4.6 and Gemini 3.1 Pro, the group argued that once manufacturing reaches the million-unit scale, the primary cost driver shifts from fixed overhead to the raw Bill of Materials, where the 8-inch drive's physical size becomes an insurmountable liability.

All 6 models agreed on "No" after discussion

Strongest Arguments

• No: At massive volume, fixed costs like R&D are amortized to near zero, leaving the Bill of Materials (BOM) as the final price floor; because the 8-inch drive requires significantly more raw material, more powerful motors to handle inertia, and larger chassis components, it has a higher irreducible cost that economies of scale cannot eliminate.