HDAT2 is program for test or diagnostics of ATA/ATAPI/SATA, SSD and SCSI/USB devices. It will not execute in a DOS session under Windows. You should make a DOS boot floppy disk or CD/DVD and boot your system for it and execute this program from that floppy disk or CD-ROM.

HDAT2 program has 2 levels:
Device testing:
- main function is testing and repair (to regenerate) bad sectors for detected devices
- you get much information about detected devices
File system testing:
- read/find/check items (MBR, boot, directories, etc.) of file system FAT12/16/32
- check/remove (regenerates) bad sectors records, flags in FAT table