It would appear that is incorrect. Either that or the iPaq 21x is NOT compliant with the SDHC standard or the minimum is not a real minimum and applies to only certain devices. My tests using Pocket Mechanic Professional suggest that the iPaq 21x dos not support these "minimum" speeds at least with the SDHC class 6 cards I have access to. I asked this question of HP and was told that HP does not acknowledge any requirement to "support" any type of minimum speed for the SDHC slot....

Also there are now reports that the SD slot and SDHC memory cards also has the ability to drain the iPaq 21x battery. So just using SD cards does not guarantee that one will not deplete the battery while the unit is off.