What does the mobile phone memory card AM mean?

It should be AM (ActiveMemory) system, which can support users to store personal settings, and it is more convenient for multiple users/cameras.

Lexar, a world-famous manufacturer of digital storage equipment, introduced the hot-plug technology system of ActiveMemory TM system in 2004. The design purpose of this system is to improve the working efficiency of the whole digital photography workflow by shortening the reading and writing time of the digital camera memory card.

As the core content of this technical system, the professional CompactFlash TM card can store the user information and related setting information of the digital camera that took these photos in the protected area on the card. This information can only be modified on the digital camera that took these photos or the equipment that supports the hot plug technology system of ActiveMemory TM system. Because this information is not stored in the standard DOS file system on the card, even if the card is formatted and then written with data and reformatted, the data will not disappear.