I have external hard disk and i checked its health with CrystalDiskInfo, Windows 7 chkdsk, and HD Tune. CrystalDiskInfo showed that the health status is good, Windows 7 chkdsk didn't find any errors, but HD Tune showed (C4) Reallocated Event Count warning with these values: current=100, worst=100, threshold=0, data=4. Which program and test to trust?