Speed up scan process by additional scan thread of another device!
Directly after scan started get the number of physical drives and file names of in the second/other thread [1] of process. After that start a parallel thread of another drive scan by a known file names (getted in the first parralel thread [1] after scan started). Drives (here for axample HDD) are so slow - in 50-200 times slower than RAM and CPUs are powerful - multi-core(d) or having high frequency one core, so scan process time can be greatly reduced/optimized if now to scan just one volume by another. Provide such functionality for one logical folder scan also, that physically situated on 2/3/several drives.