SSDs do not have any moving parts. The item description is incorrect. Be wary web shopper! 
There are HDs with small SSDs in them, some sort of hybrid setup. The hybrid setup is probably not what you want. It's probably not what anyone wants, really.
When searching the part number listed on the auction (CT064M4SSD2), I find a normal crucial SATA III SSD. All SATA should be compatible -some tweaking may be required- however, you will not see the full capability of the drive without SATA III.
If you're looking to speed up an old system, an SSD is your ticket! It will blow your freaking mind!!! Your old P4 will run like never before. It will bootup and launch programs faster than almost any machine with a classic HD, old or new. Even using SATA I. Slow disk caching is a thing of the past! Be free!!! Also, when you do choose to get a new PC, you will be able to migrate your SSD with. That's an investment!
The part number listed is a good SSD. I know it may be tempting to buy an older or refurbished SSD at a better price, and that's OK. Just make sure the SSD you are going to get has a sandforce 2 or better controller. Any drive that is SATA III compatible should be fine. 64gb should be the smallest drive you're considering.
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