Quarantine filesystem

A quarantine filesystem comprising:

• a primary mass storage device;
• a secondary mass storage device;
• an operating system having filesystem resources for implementing mass storage transactions between application software using the operating system and mass storage devices;
• a quarantine filesystem shim in communication with the operating system;
• a primary filesystem driver coupled to the quarantine filesystem shim and to the primary mass storage device;
• and
• a delta filesystem driver coupled to the quarantine filesystem shim and to the secondary mass storage device.

A method of operating a filesystem comprising:

• initiating a filesystem transaction in an operating system;
• executing the filesystem transaction using an external storage device that is physically separable from the computer system implementing the filesystem;
• analyzing the external storage device to confirm that the filesystem transaction will not adversely impact integrity of a primary filesystem;
• and
• upon determining that the transaction will not adversely impact the primary filesystem, executing the filesystem transaction against the primary filesystem.