There is a firmware update that enables the use of SDHC cards:
Firmware Update Software for K100D | Software Downloads?RICOH IMAGING CANADA
With a bit of luck you may be able to create a 1Gb FAT32 partition on your SDHC card that might be recognized by the K100D even before you update its firmware.
Or, grab a standard SD card for $4.95 and use that to carry out the update
Transcend 2GB SD Memory Card TS2GSDC B&H Photo Video Adam
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