I hate to spoil your fantasy, but...
Firstly, have you actually seen the drive? It's not anything like a normal IDE drive, it's a full length PCI board with up to 8 1GB SDRAM cards on it. Furthermore, in order to keep the actual contents, you need an external UPS system. The whole thing would take extensive rewiring of the empeg in order to fit it in, to say nothing of the power considerations.
Then, have you seen the cost of 1GB SDRAM modules? RAM prices are not coming down any time soon, and even if they do they'll still be out of the reach of most of us.
And, thirdly, consider that, at the very most, we need to read 400KB/sec off the drives continuously. My Zip drive can do that! The empeg fills up its (8MB?) buffer and then switches the hard drive off, for greater efficiency. The QikDrive is designed for applications like caches, swap files and databases where you need the high bandwidth requirement and are prepared to pay the big bucks to get it.
This, to my mind, is just another one of those things that exemplifies Slashdot's role in modern news. It's a neat gadget, but to actually consider it as a useful solution to store your MP3 files on it is typical of the average Slashdot reader's lack of contact with reality.
Nice gadget, wrong application.
<font face="lucida console">Save the whales. Feed the hungry. Free the mallocs.</font>
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Owner of Mark I empeg 00061, now better than ever - (Thanks, Rod!) - and Karma 3930000004550