Ok, let’s see if we can simplify things here, as it seems like you’re not too clued in on all the technical mumbo jumbo.
irishstu is most likely correct, Acer and many other companies have a hidden recovery partition on the hard drive which allows you to restore the machine back to the factory defaults if something was to go wrong with the installation.
BFM is also correct in as much as hard drive sizes aren’t the same as the space that is usable for one or another reason. Why you have two drives is because the hard drive has been partitioned, or shared up into several parts, I don’t really like this, but it’s also done quite often and companies such as Dell charges extra for this “service”.
With regards to the memory, to make things easy, Google for CPU-Z and download it, run it and go to the tab labeled SPD, there’s a drop down box there that says Slot #1, if you have a Slot #2 that says anything but Empty when selected, then you have two 512MB modules installed and it means that you’d have to remove both of them before you can upgrade the memory beying 1.5GB. Otherwise you could just add a single 1GB module, as 2GB should be more than enough unless you do a lot of heavy image or video editing on your notebook.
Stick with DDR2 667MHz SO-DIMM’s, anything else would be a waste of money, as it’s unlikely that the chipset in your notebook supports anything faster unless it’s a brand new model with the PM45 or GM45 chipsets (again, CPU-Z will tell you this on the Mainboard tab). A 1GB 667MHz SO-DIMM goes for about NT$650 online shopping.pchome.com.tw/?mod=stor … _NO=AGAD11 but the 3C shops will most likely charge a couple of hundred NT more.
Computer stuff is in general a lot cheaper in the US, which really sucks as most of it is made in this part of the world, but for some reason the rest of the world seems to pay up for this stuff to be cheap in the US… and yes, I’m very annoyed about it…