[MrGoodtunes]

The distinction between microSD (non HC) and microSDHC is that the former has its own controller on the card, versus the latter which has no controller. That allows HC cards more room for memory so they can have high capacity, but requires their host device to supply a controller. Our PDAs can easily do this, I'm guessing \Windows\SDHC.dll is the driver/controller? In any case, it's not surprising that the guitardoc has noticed Touch performs better with HC, because it's controlled by Touch's own driver (versus non-HC using whatever controller is on the card).