Well, I can't tell you how your m14 r2 will behave with a HDD as second drive. But I can tell you that 5400 rpm drives are no fun at all, in fact they can become the bottleneck of your system. However their existence can be justified by the amount of power they save. I have made good experiences with 5400 rpm drives, but those were desktop drives in a raid configuration and used for large continuous reads. As primary disk a 5400 rpm HDD is a no-go, but if you only use the as 2nd drive for storage of large files like movies the 5400 rpm drive is ok, in fact it may buy you even some extra mobility. If you plan to install applications or games only a 7200 rpm drive or an SSD can satisfy you. The way i see it, installing an 5400 in a m14x R2 is like installing a cheap set of tires on a sports car. PS: I have swaped my CD-ROM drive for a 7200 rpm drive for storage purposes and am quite happy about it, except that after a long time of no access the disk has to spin on again which takes about 0.5-1 sec. Acceptable but absolutely inconvenient. PPS: What's with the Delorean? - Is that beauty yours?