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Library › Vintage forms › Retro media · 1981 ·

8 in floppy disk (200 mm)

What are the exact dimensions of an 8 inch floppy disk? · Modern device · basis: ECMA-69, 200 mm flexible disk cartridge, double-density two-sided

Also called: 8 inch floppy disk dimensions, 8 inch floppy size mm, 8" diskette size, disquete 8 pulgadas medidas, disquete 8 polegadas, Diskette 8 Zoll Maße

Exact dimensions. True size, with no printing tolerance added.

length
203.2 mm
width
203.2 mm
height
2.1 mm

Notes

  • An 8 inch floppy disk jacket is a 203.2 mm square (l1 = 203.2 ±0.4 mm, corners 90° ±30′) and between 1.2 and 2.1 mm thick overall (ECMA-69 §3.1). The central window is Ø58.40 ±0.15 mm, centred 101.6 mm from the reference edge — the middle of the jacket.
  • The file is the jacket at the published size: 203.2 × 203.2 mm, drawn 2.1 mm thick (the standard's maximum overall thickness), with the Ø58.4 mm central window at the jacket centre; no printing allowance. Index and head windows are listed above but not modelled.

8 in floppy disk size chart

dimensionvalue
jacket side (l1)203.2 mm ±0.4
corner angle90° ±30′
overall thickness (e2)over 1.2 mm, under 2.1 mm
gaugefalls freely through a 2.6 mm slot, 150 mm deep
central window (d1)Ø58.4 mm
central window centre (l2)101.6 mm ±0.3 from the reference edge
index window (d2)Ø7.7 mm ±0.1 at l3 85.09 / l4 135.95 mm ±0.25
jacket wall and liner (e1)0.45 mm ±0.15

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Ecma InternationalECMA-69 (PDF)webPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

8-inch-floppy-disk-200-mm-jacketJacket 203.2 mm square × 2.1 mm, Ø58.4 central window (ECMA-69 nominal)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=8-inch-floppy-disk-200-mm

8 in floppy disk (200 mm), isometric render of a generated part
Render of 8-inch-floppy-disk-200-mm-jacket from the free STEP; not to scale.

Fits with

3.5 in floppy disk (90 mm diskette), isometric render of a generated part
3.5 in floppy disk (90 mm diskette)94.0×90.0×3.3 mm★ 1 file
5.25 in floppy disk (130 mm minifloppy), isometric render of a generated part
5.25 in floppy disk (130 mm minifloppy)133.3×133.3×2.1 mm★ 1 file
CD / DVD disc Ø120 × 1.2 mm with Ø15 hole (and mini CD Ø80), isometric render of a generated part
CD / DVD disc Ø120 × 1.2 mm with Ø15 hole (and mini CD Ø80)2 sizes★ 2 files

Questions

How big is an 8 inch floppy disk?

The jacket is 203.2 mm square and under 2.1 mm thick, with a Ø58.4 mm centre window (ECMA-69).