Freedom251 › Hardware Diagnostic Software
HDAT2
What HDAT2 is
HDAT2 is a drive diagnostic program for ATA, ATAPI, SATA, NVMe, SSD and SCSI/USB devices. Its device tests can check detected drives and repair bad sectors. A separate file-system testing level works with MBR/GPT, boot data and directories on FAT12/16/32, exFAT and NTFS. SMART functions are available for ATA/SATA, SCSI and NVMe drives. HDAT2 also includes SET MAX and Device Configuration Overlay controls, including options to restore full drive capacity, and can convert supported SATA/NVMe devices between 512e logical sectors and 4Kn. It detects devices on AHCI and some RAID controllers, and USB devices through USB ASPI or BIOS when supported. The main program requires a real DOS system booted from USB, floppy disk or CD/DVD; the Windows 32/64-bit demo runs only at drive level, omits file-level operation and aborts almost all commands while simulating conflicts. The freeware plan is free, for one or more machines, with redistribution without profit; it is provided as-is without warranty.
Who it suits
HDAT2 suits users diagnosing supported drives who can boot a real DOS system. Its Windows demo is for limited drive-level operation, not full testing.
What it does well
- Tests and repairs bad sectors on detected devices.
- File-system tests cover MBR/GPT, boot data and several formats.
- SMART functions cover ATA/SATA, SCSI and NVMe.
- Includes controls to restore full drive capacity.
What to know first
- The main program requires a real DOS boot system.
- The Windows demo omits file-level operation.
- The demo aborts almost all commands while simulating conflicts.
- Versions 6.x/7.x support only 32-bit AHCI.
Limits
The freeware plan is provided as-is without warranty and permits redistribution only without profit. The Windows demo operates only at drive level, provides no file-level functions and aborts almost all commands while simulating conflicts.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| HDAT2 freeware | one or more machines · redistribution without profit · provided as-is without warranty | Free |
As hdat2.com lists them, read 30 Sept 2026. The maker's own page has the final word.
Getting started
- Open the HDAT2 website and download page.
- Review the Cookbook, user manuals, DOS USB creation guide or FAQ.
- Prepare a real DOS boot system on USB, floppy disk or CD/DVD.
- Boot the system and run the main program.
- For the Windows demo, use HDAT2WDEM_76.EXE on a Windows 32/64-bit system.
Verdict
HDAT2 offers broad device and file-system diagnostics, along with drive-capacity and SMART functions. Its main program requires DOS, and the Windows demo has substantial command and file-level limits.
Questions
How much does HDAT2 cost?
The HDAT2 freeware plan is free for one or more machines.
Does HDAT2 have a Windows version?
A Windows 32/64-bit demo is available as HDAT2WDEM_76.EXE. The main program requires a real DOS system.
What storage devices can it diagnose?
Its stated scope includes ATA, ATAPI, SATA, NVMe, SSD and SCSI/USB devices.
Can HDAT2 test file systems?
Its file-system testing level handles MBR/GPT, boot data and directories on FAT12/16/32, exFAT and NTFS.
What does the Windows demo include?
It operates only at drive level, has no file-level functions and aborts almost all commands while simulating conflicts.
Facts from HDAT2's own pages
- Capacity controls
- The program implements SET MAX and Device Configuration Overlay features, including restoring full drive capacity. · 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
- 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
- Documentation
- The download page provides the HDAT2 Cookbook, user manuals, a DOS USB creation guide and an FAQ. · 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
- 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
- Known limitations
- Versions 6.x/7.x support 32-bit AHCI only and do not support AHCI Port-Multipliers. · 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
- 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
- Sector conversion
- SATA/NVMe devices can be converted between 512e logical sectors and 4Kn 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
- SMART
- SMART functions are available for ATA/SATA, SCSI and NVMe drives. · 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
- Windows demo
- The Win32/64 demo is distributed as HDAT2WDEM_76.EXE for Windows 32/64-bit systems. · hdat2.com, 30 Sept 2026
Where HDAT2 stands on Freedom251
- Hardware Diagnostic Software#7 of 26
- Disk Diagnostic Software#9 of 26