# 8 in floppy disk (200 mm)

> What are the exact dimensions of an 8 inch floppy disk?

- Category: Vintage forms › Retro media · 1981
- Kind: Modern device
- Basis: ECMA-69, 200 mm flexible disk cartridge, double-density two-sided
- Page: https://xemstudio.com/objects/8-inch-floppy-disk-200-mm/ · JSON: https://xemstudio.com/api/geometry?object=8-inch-floppy-disk-200-mm · Plain text: https://xemstudio.com/objects/8-inch-floppy-disk-200-mm/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 203.2 | 203.2 | 2.1 |

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

## 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. 

## Sizes

| dimension | value |
|---|---|
| jacket side (l1) | 203.2 mm ±0.4 |
| corner angle | 90° ±30′ |
| overall thickness (e2) | over 1.2 mm, under 2.1 mm |
| gauge | falls 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

- Ecma International: [ECMA-69 (PDF)](https://ecma-international.org/wp-content/uploads/ECMA-69_1st_edition_january_1981.pdf) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/8-inch-floppy-disk-200-mm/index.json

- 8-inch-floppy-disk-200-mm-jacket: [STEP](https://xemstudio.com/files/hardware/8-inch-floppy-disk-200-mm/8-inch-floppy-disk-200-mm-jacket.step) · [STL](https://xemstudio.com/files/hardware/8-inch-floppy-disk-200-mm/8-inch-floppy-disk-200-mm-jacket.stl) — Jacket 203.2 mm square × 2.1 mm, Ø58.4 central window (ECMA-69 nominal)

## 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).

## Fits with

- [3.5 in floppy disk (90 mm diskette)](https://xemstudio.com/objects/3-5-inch-floppy-disk-90-mm/)
- [5.25 in floppy disk (130 mm minifloppy)](https://xemstudio.com/objects/5-25-inch-floppy-disk-130-mm/)
- [CD / DVD disc Ø120 × 1.2 mm with Ø15 hole (and mini CD Ø80)](https://xemstudio.com/objects/cd-dvd-discs/)