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Italiano: non è una lista completa (né facile da procurarsi) ma ecco qui lo spazio necessario in fase d’installazione di numerose versioni di Mac OS X, reperite dalla fonte ufficiale, Apple.

English: altough patchy and incomplete, straight from Apple’s website and knowledge base, here is the required space for installing various versions of Mac OS X
 
 

Da leggere prima di installare Mac OS X (10.0 nda)

almeno 1.5 GB di spazio disco disponibile

(translation: at least 1.5 GB of available space)
Url: PDF in italian downloaded from docs.info.apple.com/article.html?artnum=50071

Mac OS X 10.2 – Read Before You Install

The amount of disk space required depends on your computer and the way you are installing Mac OS X. If you see a message that you do not have enough disk space to install Mac OS X, you can deselect items to save space.

Url: PDF downloaded from docs.info.apple.com/article.html?artnum=51764

Requirements for Mac OS X 10.3

At least 1.5 GB free hard disk space.
Note: For Mac OS X 10.2 or later, 3.0 GB is the recommended minimum. The exact amount required depends on your computer and how you install Mac OS X (default versus custom installation, for example).

Url: support.apple.com/kb/HT2176

Mac OS X 10.4 Tiger system requirements

At least 3 GB of free disk space; 4 GB if you install the XCode 2 Developer Tools

Url: support.apple.com/kb/HT1514

Apple – Mac OS X Leopard (10.5 nda) – Technical Specs

9 GB of available disk space
[...] Developer tools require 1GB of memory and an additional 3GB of available disk space

Url: www.apple.com/macosx/techspecs/

Mac OS X Server 10.0 to 10.3: System Requirements

Hard disk space
4 GB

Url: docs.info.apple.com/article.html?artnum=107685