With drives over 128GB, as far as the Mac OS revision, you will be stuck with Mac OS 9.2.2 only, as it contains Apple Drive Setup V2.1. We have tested the following Macs and they can see hard drives of up to 500GB within Mac OS 9.2.2: QuickSilver 733, QuickSilver 800, QuickSilver DP 800, QuickSilver 867, QuickSilver 933, QuickSilver Dual 1 GHz with logic board 820-1342-B (QS logic board 820-1276-A will NOT work and peak out at 128 GB), All FW400 MDD models, Titanium PowerBook 800, Titanium PowerBook 867, Titanium PowerBook 1Ghz will work nicely. Well, it is the ability of the Mac to see the total number of heads, cylinders, and sectors of large hard drives.

What the hell is 48-bit LBA compliant, you ask? If you intend to use PATA/IDE hard drives larger than 128GB under OS 9, then be aware that you will need the combination of a Mac with an IDE controller that is 48-bit LBA compliant and operating system version 9.2.2 IF YOU ARE GOING TO USE A HARD DRIVE GREATER THAN 128 GB USE Mac OS 9.2.2 MacOS 9.1 Update -> MacOS 9.2.1 Update -> MacOS 9.2.2 Update If your Mac system restore leaves you in the V9.0 realm, it can be patched as follows: So, you are half way there, with only V9.1, V9.2, V9.2.1, and V9.2.2 to consider. You can probably rule out V9.0, V9.02, V9.03, and V9.04 for stability issues and the lack of enhancements. However, I can tell you from personal experience that it is best to do some research after you decide upon your favorite application(s). In general, many users have favored the very last revision, Mac OS 9.2.2 as the most stable and preferred version. Unfortunately, there has always been a heated debate on which Mac OS 9 version to install. Below you will find some general background info:

Skype for mac os 9.2