Hi Tony,
I haven't tried the 512MB PQI card but I bought a 64MB version, by the same manufacturer, some time ago and have not experienced any problems.
If the card bears the genuine 'SD' logo and is from a reputable manufacturer, then it should be compatible with all SD devices. Multi-Media cards, which look the same as the SD cards, but do not bear the 'SD' logo and have a connector pin missing, are not 100% compatible.
Is anyone else using a PQI SD card??

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)