Use usb drive as disc cache?

I see Windows suggests using a USB 2.0 drive as a faster Hard Drive Cache. Does Apple OS support this?
And besides letting the OS defrag and do other "cleanup" functions, are there other things, besides just more memory, to speed the laptop? Even when I have nothing open but Activity Monitor, and 1GB free memory, things are taking 'forever' [a min or more to open Safari while the system seems to be doing other things]. CPU is showing under 10% busy, over 50GB free hard drive, but even "Finder" locks up. Original 2GB RAM still in the system.

John,
Two thoughts on using a USB external:
1.) it will be slow. I use FW-800 externals, setup as Steve & Chuck recommend. Try the USB, but be prepared for slow playback and also slowdowns as you edit. I used USB once, and swore never again.
2.) set up the drive letter in your OS, so that it is always, say F:\. This must be done in the OS, since you might have other drives (thumb, flash, etc.) that would automatically get that drive letter, unless you set it in the OS. If you move your USB external between machines, you will want to set it up as the same drive letter in the OS of all other machines. If you have multiple machines, check to see available drive letters and choose one of these. I have 4 2TB FW-800 externals that are set to W, X Y & Z in the OS of all three machines. Everytime I plug one of these in, it is ALWAYS the same drive letter.
Good luck,
Hunt

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