You say the problem was super simple, but in reality it may not be. Just because you have some .wav files does not mean that they're in the standard "PCM" format.. You said that they were "Olympus" wave files, I wouldn't put it past Olympus to have their own proprietary file format for these files..
As long as you have the proper codecs in place, iTunes will be able to play and encode these files...
The nano does play standard PCM .wav files.. The problem likely is that your wav files aren't real standardized wav files, they're Olympus wav files in Olympus's proprietary file format.. Olympus has been known to pull stunts like that where instead of using an industry standard, they create their own way of doing things that break compatibility.. They do it with their proprietary memory cards so they can make royalties on every memory chip sold and I wouldn't be surprised if they did it on file formats as well..
I can't imagine any reason why anybody would even have .wav files on their PC as the ideal format to preserve quality and maintain a sane amount of hard drive space would be some lossless codec like FLAK or loseless AAC.. As long as you encode to lossless AAC. You will see a huge reduction in file size and no reduction in quality, and it will be playable on an iPod nano..
Your problem likely is that, what you think are .wav files aren't really PCM standard .wav files.. But as long as you have some olympus software / codecs installed, they should be playable and encodeable to other formats..
So just convert to Apple Lossless and you'll be fine.. Unless of course for some reason that you can't play/encode these files on your PC and then you might be SOL..
P.S. You can't expect Apple to know all about how some proprietary Olympus file format that Olympus conveniently named ".wav" may not really follow the standardized ".wav" PCM file format..
P.P.S. Import the files into itunes, go into your preferences, make sure that your conversion / encoding settings are set to apple lossless.. Then select the files in itunes, right click and convert /encode them..
P.P.P.S. And no, renaming the files does nothing.. The files will still be in the same format that they were before, except now they'll be incorrectly named. You should encode / transcode them to a lossless codec to preserve 100% quality (not MP3 since that is a lossy codec that removes things on the cusp of being audible in order to shrink file size as much as possible.).
Onboard RAID vs. 3Ware RAIDI never recommend people run RAID-5 with onboard chipsets.