Some Leica M9 owners are discovering that their camera will suddenly stop functioning and render their SD card unreadable on any device. Photographer Gil Lavi writes on his blog,
A couple of weeks ago I got a new Leica M9. All excited, I put in the best SD card on the market, the SanDisk Extreme Pro 8GB. It took only a few hours of taking pictures before the card crashed and the camera become unresponsive until I removed the card. I wasn’t worried at the beginning. I was in love.
A few days after, I had a high profile portrait photo shoot for an important client. Of course I took the M9 and my beloved Leica 90mm with me, together with a new SanDisk SD card, not before installing the newest firmware update. It was a very long photo shoot with heavy production, a tight schedule and sweaty assistants. It was just before that end of the photo shoot that the other new SanDisk SD card Extreme crashed inside the M9, making the camera dead and the card unreadable in any device. With all the embarrassment, I had to reshoot everything all over again with my backup equipment.
Leica and SanDisk are currently investigating this issue after a number of customers have reported it, and currently recommend that SD cards be FAT formatted.