I saw a thread about SD cards in the H Plus and read of problems with Samsung cards so I'm posting my experiences.
I received this today:
Samsung 64GB 100MB/s (U3) MicroSD EVO Select Memory Card with Adapter (MB-ME64GA/AM)
It was $12.99 before taxes. I didn't know if formatting was required before installation so I Googled. I didn't see anything about formatting so I just installed it. After the ST16 recognized the camera a Failure to initialize message was briefly displayed. Then I recorded 5 seconds of video as a test. I removed the card and I checked in my computer and the 5 second video looked fine.
I received this today:
Samsung 64GB 100MB/s (U3) MicroSD EVO Select Memory Card with Adapter (MB-ME64GA/AM)
It was $12.99 before taxes. I didn't know if formatting was required before installation so I Googled. I didn't see anything about formatting so I just installed it. After the ST16 recognized the camera a Failure to initialize message was briefly displayed. Then I recorded 5 seconds of video as a test. I removed the card and I checked in my computer and the 5 second video looked fine.