I had a bad experience with my MixPre6 today. After soundcheck, I returned to my machine in advance of showtime, and the SD gave me a card error. I removed and reinserted the card, then it said BAD CARD.
This is the SD 32 GB card. YEAH, the one with the Sound Devices branding, which is the ONLY recommended card for this unit. I have a spare, but I used a Sandisk today and it seemed to go fine.
But I'm not pleased.