CD / DVD disc Ø120 × 1.2 mm with Ø15 hole (and mini CD Ø80) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/cd-dvd-discs/  (CC BY 4.0)
Basis: ECMA-130 / ISO 9660 physical disc: Ø120 × 1.2 mm, Ø15 mm centre hole; mini CD Ø80
Catalog version: 2026-10-20

Sizes: see table below
- CD, DVD and Blu-ray discs share one physical size: Ø120.0 × 1.2 mm with a Ø15.0 mm centre hole (held to +0.1), about 16 g.
- The mini CD is Ø80 × 1.2 with the same Ø15 hole, about 7 g.
- Both files are flat rings drawn at those nominal sizes; the hubs in the can-engine kit are drawn with a Ø15.0 spigot for the hole (see Mating features there).
- On the can engine I use a CD as the flywheel: 16 g spread out to Ø120.

disc  dia_mm  thickness_mm  hole_mm  mass_g
CD / DVD / Blu-ray  120  1.2  15  16
mini CD  80  1.2  15  7

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Compact disc — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Compact_disc
- Wikipedia: Hard disk drive platter — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hard_disk_drive_platter
- Long Earth Society: Engine builds (videos and write-ups) — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/cd-dvd-discs/index.json
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