According to
HP's Quick Specs for the IPAQ 200, SDIO (High Capacity) cards are supported:
At A Glance
* Processor: Marvell PXA310, 624 MHz
* ROM: 256MB
* RAM: 128MB for running applications
* Display: 4-inch VGA TFT with touch screen, portrait oriented
* Wireless LAN: IEEE 802.11b/g with WEP through WPA2-Enterprise (EAP-TLS and PEAP) and WiFi Multimedia1
* Bluetooth: v2.0 with EDR1
* Connectors: 24-pin connector and Mini USB
* Battery: 2200 mAh
*
Expansion: SDIO (high-capacity), CompactFlash HC
* Headphone jack: 3.5mm -3 or 4-pin
* Speaker: 1
* Receiver: 1
* Microphone: 1
* Input: touch, stylus
* Buttons: 5-way navigation with press to activate, 4 programmable, voice recorder, power, reset
* LED: 2
* Operating System: Windows Mobile® 6 Classic Edition
Pocket PCs are not designed to use the speed of high speed cards. Unless you are planning to use your card in a camera (which does utilize the high speed cards), stick with a lower speed card.