I have 3 different makes of SD card and had no problems with any of them. They are Panasonic, I.O Data and SanDisk. All contacts look identical and are actually gold plated edge contacts on the PCB. None have a missing contact. Having said this, I have only used them in the KN7000 not the Card reader.
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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....)