Any card that exceeds 2GB must meet SDHC specifications and should display the SDHC logo. While I certainly don't know every card and have never seen the PQI 4GB, a visualon the internet indicates thatitdoes NOT carry the SDHClogo.
PQI Visual: http://us.st11.yimg.com/us.st.yimg.c...1924_231962950
SDHC logo: http://www.sdcard.org/sdhc/index.html
Based on that, I would not recommend using the PQI card.
Above from Sanyo.I bought 3 PQI 4GB cards for my HD1A since you used them in your review, but none work.Any ideas? Sneezy-Thanks