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Implemented as a kernel mode filter driver, sitting below the NTFS file system driver, MRCBT is able to intercept all I/O requests to the logical volume and maintain a record of which blocks have changed.
Through discussions with our customers and after careful consideration, we decided to remove the functionality from MRCBT that allowed it to detect whether a volume had been mounted outside the current Windows session (i.e. USB flash drives and dual-boot systems) and instead, focus solely on optimizing MRCBT to reduce incremental backups times in the current Windows session. This decision enables us to provide one of the most robust Changed Block Tracking solutions available to date.
Traditionally, Macrium Reflect has detected changes to the file system by comparing the NTFS Master File Table (MFT) on the source volume, with the MFT of the most recent image in the backup set. While this is method is one of the quickest solutions available, we do not consider it an optimal solution when used in a continuous incremental scenario, especially if multi-GB files are present in the file system.
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