I purchased large (1TB) flash drives to try this as it sounded useful. Windows 10 machine with 700 GB fill on a 1TB SSD, Intel i7. Took over 24 hours and eventually went to 0% CPU utilization and simply hung. Did not produce a result. Major Fail. Windows 11 machine with about 200GB fill on a 1TB SSD. Again Intel i7. Again hung. Also gave message of missing other drive letter. ??. After several hours of no progress cancelled. Major Fail. Manual gives no help on this.