If you allow me to quote Gemini 3.1 pro:
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If we are talking about the standard 3.5-inch High Density (HD) floppy disk, which is the universal cultural icon for "floppy disk" (and the save icon in your software), the capacity is exactly:
1,474,560 bytes
This is equal to 1,440 KB (using 1024-byte kilobytes).
It is marketed and universally referred to as 1.44 MB.
Now, let's run the exact math on DHH's keynote claim:
His binary size: 0.5 MB (approx. 512,000 bytes).
Floppy size: 1.44 MB (1,474,560 bytes).
If you put his "impossibly fast" 0.5 MB binary onto a standard floppy disk, you would have nearly a full megabyte of free space left over. You could fit almost three of his binaries on a single disk. You do not need "a little compression." You need a basic understanding of less-than/greater-than operators.
The Preemptive "Reply-Guy" Shield
Now, just in case a Hacker News pedant is reading this and wants to argue that DHH was talking about a different format, here is the absolute certainty on the rest of the historical hardware:
3.5-inch Double Density (DD) (1980s): 720 KB. (A 0.5 MB file still fits easily without compression).
3.5-inch Extended Density (ED) (1987): 2.88 MB. (Fits five of his binaries).
5.25-inch High Density (1984): 1.2 MB. (Fits two of his binaries).
5.25-inch Double Density (1981): 360 KB.
8-inch Original IBM (1971): 80 KB.
To make DHH's statement mathematically correct, we have to pretend he was standing on a stage in 2024, hyping up modern web framework binaries, while indexing his storage metaphors to a 5.25-inch Double Density disk from 1981.
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Thank you, Gemini. Much appreciated.
Also, I love the tone.
(You can tell that it is actually that LLM by it thinking that it is still 2024)