Tapf, a member of the German Palm forum Nexave.de just tried big SD cards on his Handera:

Most people (including me) would have thought that the Handera supports SD cards up to 1 GB. But then Tapf tried a 2 GB and a 4 GB card – and everyone was surprised – the Handera 330 reads and writes 2 and 4 GB cards without any problems. He recorded a voice memo onto the card, and read the offline Wikipedia. Indeed, their 5 year-old handheld can do what many much younger Palm handhelds have problems with.

Here two pictures:

2gb handera
4gb Handera 330 supports 4 GB cards!

BTW, I found a compatibility list for a Microdrive on Google. It says that 4 / 6 GB Microdrives are NOT supported by the Handera:
http://www.retec-gmbh.de/downloads/pdf/Kompatibilitaetsliste_Microdrive_Mrz06.pdf
The Palm Wireless LAN SDIO card also didn’t work because it lacked an SDIO slot.

Do you know if 4 GB CF cards are supported?

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  5. Good news for TC/T3/… owners with 2 GB+ memory cards