I know this but the 'address book' is not 10% of the drive capacity. 100 byte address data for every 1k of stored data, that'd be one hell of an inefficient storage system.
True enough, but it still contributes.
Clearly the OS, XMB etc. take up a finite amount, and then there's the caching required (PS3 is low on system memory, so all that data from the BD has to go somewhere, and a hard drive is much faster than the BD)
I read somewhere that the PS3 uses "about" 10 GB (unsure of units) for its cache... which is a lot, granted - perhaps the cache allocated is a percentage of the total hard drive capacity?
Anyway, it seems like you answered your own question back there
I suppose it's a bit like Windows' system restore and virtual memory settings, they take up huuuge amounts of space (system restore is for n00bz anyway

)
I have 3.2 GB of RAM (well, 4 GiB on a 32-bit sys.

) and Windows "recommends" 4.6 GB of virtual memory - I specified 2 GiB, with a max of 4 GiB and it's not had to increase that figure from 2 GiB in 18 months. I rarely max out the system memory (thanks to unnecessary caching), and I'm a bit of a multi-task "hoor", with an aversion for shutdown / restarts...
Either way, 10% isn't much to cry about in my opinion
@
TorqueHappenS08 Que? Serial? Maybe he's seeking a less voracious fanbase...