Abstract: A backing up and recovering method of a file system is applied to a communication device. In the backing up and recovering method, a detecting step is performed to drive a first processing unit to detect whether the file system is damaged, and then generate a detection result. A transmitting step is performed to drive the first processing unit to transmit the detection result to a second processing unit. In response to the detection result being the file system is damaged, the second processing unit executes a system recovering step which recovers the file system according to a backup data that corresponds to the file system and is stored in a storage unit, and in response to the file system being not damaged, the second processing unit executes a backup confirming step which confirms whether the storage unit has the backup data.

Abstract: A pre-cryogenic electron microscope specimen holder is disclosed. The pre-cryogenic electron microscope specimen holder includes a specimen holding member and a cryogenic energy storing member. The cryogenic energy storing member further includes a liquid gas storing trench formed therein to store the liquid gas. The cryogenic energy storing member is disposed under the specimen holding member to further supply the cryogenic energy to the specimen to extend the observation time for the specimen in an electron microscope.