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Each dongle of the Guardant family contains a special 4-byte number – dongle’s ID. This ID is unique. It is recorded into the dongle as a factory setting and cannot be copied or changed by anyone including the developers of Guardant. The value of the ID can be used for establishing a fixed link between the protected application and this particular dongle. Use the diagnostics utility to view the dongle’s ID, or the utility for programming the dongles called GrdUtil.exe.
Memory and Memory Fields
All types of Guardant dongles have non-volatile memory for storing data. We use EEPROM type memory, which provides for the data integrity during around 100 years not requiring any power supply. The dongle supports an unlimited number of reading sessions and up to 1,000,000 writing sessions into the dongle’s memory.
The memory is split into fields for the convenience of use. Generally, these fields are divided into three types: special purpose, general purpose and free purpose.
The Guardant dongle’s memory map is described in details in the next part of the documentation.