"By eliminating these rarely used SD functions the SD Compatible card is available at a more competitive price. The SD Compatible card can be used in a variety of digital products: digital music players, mobile phones, PDA's, digital cameras, car navigation systems and electronic books."

The sign of a company that cheats...I could not figure out what the compatible issue was all about...now I know.

This should be wrapped under the logo of MMC(Multi Media Card) the former unsecured former(form factor) variant of SD.

It must have been the thought it would sell better marked as SD compatible.

doni