MMC Reader and Writer

Many Nokia phone models have expansion slots for Memory Card , which provide additional memory space for images, multimedia files, third-party applications, etc. For some devices, such as the original N-Gage, the Memory Card card is directly accessible from a computer. When you hook an N-Gage to a PC via a USB cable, the Memory Card card appears as a removable disk in the Windows OS. For other devices, you can buy a generic Memory Card reader/writer and connect it to your computer via USB. In both cases, you can manipulate the files and directories via Windows Explorer, Mac OS X Finder, a Linux file manager, or the good old command line.

If you do connect in this way, you might find some interesting files (.DS_Store and .Trashes on a Mac, for example) on the Memory Card card. My advice is to ignore these, since they will be re-created each time you plug them in, and they do no harm.