When a sale is not a sale: be careful when buying discounted memory cards. The one shown, right, is a 16GB microSD card for $18 on sale through a popular merchant. But pay attention to the “C2” marking (yellow arrow) this is a Class 2 memory chip, and the speed with which data can be written to it is way too slow for most modern still and video cameras.

Now days, with cameras shooting 5Mpx (5 megapixels) images or bigger, and HD video writing each frame at 2.1Mpx, you need high speed memory. Buy Class 6 at least, Class 10 at best.

This “class rating” applies to full-size SD cards, MiniSD cards and MicroSD cards.