I've recently upgraded from an R4 to the M3i Zero, and also from a 2GB to an 8GB Micro SD card. I've had a few problems with the M3i hanging on load (and sometimes diskcheck reporting fatal errors) which I believe I have tracked down to the new Micro SD. I've formatted these 3 cards with the Panasonic SD Formatter... 1) 1GB Kingston (Japan) Micro SD 2) 2GB Kingston (Japan) Micro SD 3) 8GB Transcend (Taiwan) Micro SDHC Class 6 ...and then benchmarked them against each other using the latest 1.40 sakura firmware and a couple of games. The two Kingston cards work perfectly, even using with RTS, Soft Reset and Cheats. The new Transcend card is already showing problems! Problem 1 (most common): hangs with mauve 'NOW LOADING..." screen on bottom and black screen on top. Problem 2: disk check reports a fatal error and recommends copying files to hard disk. Problem 3: hangs during soft reset with 'M3DS REAL' logo displayed (with black) only on bottom screen. Usually by turning off and back on, it works ok after. So my question is; can anyone tell me why the Transcend card causes problems and what similar card would you recommend? Is it SDHC cards in general? 8GB cards? Class 6 SDHC cards? Something unique to the transcend brand? I wanted an 8GB card and I thought the Class 6 Transcend would be great!! Roadkil's Disk Speed (v1.1) reports the big Transcend card as fastest on average out of the three cards. It might just be me, but the Kingston cards did seem to fit a bit 'better' though in the M3i's Micro SD slot.