The i.d. mate II, i.d. mate OMNI and i.d. mate Summit can only access up to the first 2 gigabytes on its memory card. A larger capacity card can be used, but only the first 2 gigabytes of storage space will ultimately be usable. The i.d. mate II and the i.d. mate OMNI use a Compact Flash card, and the i.d. mate Summit uses an SD card. The i.d. mate Quest and i.d. mate Galaxy use an 8 gigabyte Micro SD card and can be upgraded to 32 gigabytes. Please note: Flash cards need to formatted correctly and have the proper files and folders in order to work. Please contact our technical support team for more information, 1(800)890-1180.