SD Cards

FIRST - Format every card first with the SD Card Formatter Utility - this will fix 99% of issues. Afterwards use your OS Formatter utility to format the card as exFAT.

Any SD Card should work. If you are buying a new card go for one that is a name brand such as Western Digital, SanDisk Ultra, Samsung EVO, or Kingston Canvas (to name a few).

Buy from a trusted source with easy returns if the SD card is a fake or knock off. For example Identify fake SanDisk Extreme

Newer/faster SD cards will help when moving large images on or off the SD card, but wont change the performance while using it as a SCSI device. I personally use 16GB SD cards from the MicroCenter checkout line for ~$3/each.

There is some debate that that some SD cards do not support SPI - but that seems to be debunked.

Always remember to backup your data - SD Cards can fail too.