HDAT2
Summary
HDAT2 is a free diagnostic program for ATA, ATAPI, SATA, NVMe, SSD and SCSI/USB devices. Its device-testing level checks drives and can repair bad sectors on detected devices. File-system testing covers MBR/GPT, boot data and directories on FAT12/16/32, exFAT and NTFS; SMART functions are available for ATA/SATA, SCSI and NVMe drives. The program also includes capacity controls such as SET MAX and Device Configuration Overlay, including restoration of full drive capacity. Where supported, SATA and NVMe devices can be converted between 512e logical sectors and 4Kn. HDAT2 detects devices on AHCI and some RAID controllers and can detect USB devices through USB ASPI or BIOS when supported. The main program must run from a real DOS system booted from USB, floppy disk or CD/DVD. A Windows demo is available, but it is limited to drive-level operation, omits file-level functions and aborts almost all commands while simulating conflicts. The listed freeware plan is 0.00 USD per free, for one or more machines, with redistribution without profit; it is provided as-is without warranty.
Who it is for
HDAT2 suits users diagnosing supported storage devices who can boot a real DOS system. Its Windows demo is more limited than the main program.
What is good
- Tests and repairs bad sectors on detected devices.
- SMART functions cover ATA/SATA, SCSI and NVMe.
- Supports several file systems, including exFAT and NTFS.
- Can restore full drive capacity.
- Freeware plan permits redistribution without profit.
What to know first
- Main program requires booting a real DOS system.
- Windows demo has drive-level functions only.
- Windows demo aborts almost all commands.
- Provided as-is without warranty.
Verdict
HDAT2 provides device and file-system diagnostics, but its full program requires a DOS boot environment. The Windows demo is limited and is not a substitute for its full operation.
HDAT2 plans and pricing
All plansCompared on disk diagnostic software
Facts
- Purpose
- HDAT2 tests and diagnoses ATA, ATAPI, SATA, NVMe, SSD and SCSI/USB devices.hdat2.com · 30 Sept 2026
- Repair
- Its device-testing level tests and repairs bad sectors on detected devices.hdat2.com · 30 Sept 2026
- File systems
- Its file-system testing level handles MBR/GPT, boot data and directories on FAT12/16/32, exFAT and NTFS.hdat2.com · 30 Sept 2026
- SMART
- SMART functions are available for ATA/SATA, SCSI and NVMe drives.hdat2.com · 30 Sept 2026
- Capacity controls
- The program implements SET MAX and Device Configuration Overlay features, including restoring full drive capacity.hdat2.com · 30 Sept 2026
- Sector conversion
- SATA/NVMe devices can be converted between 512e logical sectors and 4Kn when supported.hdat2.com · 30 Sept 2026
- Controller support
- HDAT2 detects devices on AHCI and some RAID controllers, and detects USB devices through USB ASPI or BIOS when supported.hdat2.com · 30 Sept 2026
- Security features
- The feature list includes SET SECURITY commands and drive-lock detection through the Security Menu.hdat2.com · 30 Sept 2026
- Operating mode
- The main program requires a real DOS system booted from USB, floppy disk or CD/DVD; only the demo runs under Windows.hdat2.com · 30 Sept 2026
- Windows demo
- The Win32/64 demo is distributed as HDAT2WDEM_76.EXE for Windows 32/64-bit systems.hdat2.com · 30 Sept 2026
- Demo limits
- The demo operates only at drive level, does not provide file level, and aborts almost all commands while simulating conflicts.hdat2.com · 30 Sept 2026
- Hardware minimum
- The minimum configuration is a 386/486 CPU with coprocessor or higher, at least 1 MB RAM and a DOS boot system.hdat2.com · 30 Sept 2026
- Version
- The site lists version 7.6 dated 19.03.2025 as the latest version.hdat2.com · 30 Sept 2026
- Known limitations
- Versions 6.x/7.x support 32-bit AHCI only and do not support AHCI Port-Multipliers.hdat2.com · 30 Sept 2026
- Documentation
- The download page provides the HDAT2 Cookbook, user manuals, a DOS USB creation guide and an FAQ.hdat2.com · 30 Sept 2026
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Sources
- hdat2.com/description.html· checked 30 Sept 2026
- hdat2.com/download.html· checked 30 Sept 2026
- hdat2.com/hdat2_main.html· checked 30 Sept 2026