SANS Digital Forensics and Incident Response Blog: Tag - time

exFAT File System Time Zone Concerns

exFAT Time Zone Concerns

The exFAT file system tracks the time zone offset of all MAC time's stored for the respective file. The file system uses 32-bit time stamps (and another byte tracking 10ms increments). Additionally, all time stamps are recorded to the file system as local machine time while applying a time zone offset that is also stored when a file is changed/modified/accessed. The implications of this include being able to track removable media across several time zones without the need for the system they were used in. (For a more detailed look at the exFAT file system, see Robert Shullich's paper on SANS Computer Forensics Resources).

exFAT stores time zone offsets in a one byte value. Vista SP1 (the first desktop release of exFAT) did NOT utilize the time zone byte. In this case, the time zone bytes will be 0x00. Since the OS

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