I've read up on this a bit. The Zune 30 use a ZIF-based 5mm 1.8inch drive. I've heard that you can replace this with a larger 5mm drive, or even an 8mm drive if you remove to top portion of the drive to fit it into the case (I haven't tried this myself, however).
I have no idea if the new 240GB Toshiba 1.8in 8mm drive works in the Zune 30. RapidRepair claims it does not. It could be a limitation in the Zune firmware.
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