SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
CrystalDiskInfo - CrystalDiskInfo. A HDD/SSD utility software which supports a part of USB connection and Intel RAID. >> Download. Intel RAID (IRST). IRST 11.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Hard Disk Sentinel - Monitoring hard disk health and temperature. Test and repair HDD problems and predict failures.
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
CrystalMark - CrystalMark is a full included benchmark application that can be utilized for surveying the execution and capacities of a PC.