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I bought an Acer Aspire One AOA-150 off of a friend for $200. I think it was a pretty good buy. Of course, I can't bring myself to go back to WinXP after using 7 for this long (even though I've got another laptop running Win2000), so I'll be doing a reinstall soon. It should run nice and smooth despite the specs.
If there's one thing I don't like, it's that the keyboard feels a bit mushy. You don't want mushy when the keyboard is so small. I also wish I'd gotten the SSD model instead of this slower drive, but the option is there in the future.
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There are certain things you can disable to take the load off the SSD, such as the page file and indexing. It's a slight improvement. I have to say, though, that I'm extremely disappointed.
If it has too little RAM, the page file is essential to begin with, disabling it will just make overall performance ever worse. Windows 7 (and any OS) won't be particularly SSD friendly unless you configure them to use a file system optimized for SSDs, or if the SSD device includes a smart enough firmware to handle this automatically. Otherwise, straight NTFS or FAT32 may prove quite troublesome. There are other issues as well like buffer flushing etc.
There articles are a good start:
Making XP pro SSD friendly
Here's another good thread, with a hint at a solution, although it's for a HP notebook:
However, first-gen SSD drives have dismal random write performance, and I recall there was a problem with certain drives trashing and flushing their onboard DRAM cache inappropriately, resulting in even slower performance.
Regarding windows and virtual memory: I don't know if it's possible to really disable it completely save for BartPE-like enviroments (ERD Commander, Ultimate Boot CD for Windows), but even if you force the system not to use a swap file, a temporary one will be created anyway, even with 2 GB of RAM to spare (dunno if it will be actually used though). At least that's how XP, Windows Server 2003 and Windows 2000 behave, not sure about Vista and 7.
So disabling the swap file may actually make things worse, as it could be forcibly created and mounted anyway, without any control over its location, fragmentation and size. You best bet is to make a dedicated "swap partition" and place the swap file there, at least this help the drive's firmware keeping the writes in one place and the cache will (hopefully) discern better between writes in different partitions.
On the converse, a recent Ubuntu Linux installation has so far not used even a byte from its swap partition.