I don't see old laptops working as NAS units, given they normally max out at 1/2TB storage if they'll support the newer drives. If you want multiple TB of storage you're out of luck.
You have an old Mac with 5 floppy drives? - you do!, great then try this,
Five-Disk Floppy RAID: 4MB of Blistering Fast Storage | Gadget Lab | Wired.com
Right, thats 5 floppy drives per mp3 - so,
5 x (number of mp3's in collection) = .............
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