Deleted member 651465
Deleted member 651465
What a combo update?
A combination update (Combo update) is a large patch than can be downloaded and applied, much the same way as a regular update (also referred to as a delta update). However, the main differentiator is that a combo update can be applied regardless of the OS version e.g. 10.5.x -> latest
A normal update is usually specific to the current OS installed e.g. 10.5.6 -> 10.5.7, and therefore is a lot smaller as a significantly smaller number of files need to be patched. The size may also depend on the platform you run PPC / Intel.
Many people believe (including myself) that the combo updates are better as they replace all the old files with new versions, where the updates would simply patch them up. This "can" lead to some problems that are usually fixed by running a permissions repair.
It doesn't take a genius to realise that downloading combo updates will take longer as a result of the increased size, but in my experience they generally carry less of a hassle with them and another benefit is that the update servers tend to be hammered from everyone getting the "new update", so you can grab the combo updates direct from the Apple site at a normal speed.

EDIT: It might be worth mentioning that updates from Software Update can be downloaded and "kept" on external disk, to speed up in the event of a system restore. After all, would you want to download another 900MB if you reformat?
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Reformat a mac due to an issue that is [apart from this MP, but thats only cos apple told me to]
which I did by trying to remove it from the Dock as I use 
