MHDD
MHDD is a free utility for low-level hard-drive diagnostics and management.
What MHDD is
MHDD is a free utility for low-level hard-drive diagnostics and management. It supports IDE, Serial ATA, and SCSI drives, and can access USB storage through USB-to-SCSI emulation drivers. Its tools can scan a drive, show SMART attributes, test it, and record scan results. It also includes commands for low-level erasure, sector reading and writing, bad-sector remapping, and changing drive size with HPA. A simple scripting engine and batch-file support allow tests to run without an operator. The maker distributes MHDD as a CD image, a self-extracting floppy image, or an archive of executable files. The manual lists an Intel Pentium or higher, 4 megabytes of RAM, a keyboard, and DR-DOS or MS-DOS 6.22 or higher. Some AHCI controllers may not be recognized; the manual suggests switching to IDE or Legacy mode if needed. It warns that erase and remap operations can damage a drive or cause data loss, so backing up first is advised. The manual also cautions that MHDD is difficult for users without deep knowledge of disk drives.
Good
- Supports IDE, Serial ATA, and SCSI drives.
- Displays SMART attributes and logs scan results.
- Includes scripting and batch-file support.
- Freeware distributed in three formats.
Watch out
- Some AHCI controllers may not be recognized.
- Erase or remap operations can cause data loss.
- The manual says it is difficult for inexperienced users.
Who it suits
MHDD is for users familiar with hard-drive operation who need low-level diagnostics or drive-management commands. Its manual warns that it may be difficult for those without that knowledge.
Verdict
MHDD offers detailed drive checks and low-level operations as freeware. Its controller caveat and data-loss warning make careful preparation important.
Plans and prices
From MHDD's own pricing page, checked 29 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| MHDD | Free | Freeware · runs on pure MS-DOS · supports IDE, Serial ATA and SCSI |
The facts
Each one read from MHDD's own pages, with the date it was checked.
What it does
- Compatibility limits
- The manual says some AHCI controllers may not be recognized and suggests switching them to IDE or Legacy mode if needed.checked 29 Sep 2026
- Data safety
- The manual warns that MHDD can cause damage or data loss and advises backing up a drive before erase or remap operations.checked 29 Sep 2026
- Diagnostics
- It can scan drives, view SMART attributes, test drives and log scan results.checked 29 Sep 2026
- Distribution
- The maker offers MHDD as a CD image, self-extracting floppy image, or archive of executable files.checked 29 Sep 2026
- Drive access
- It supports IDE, Serial ATA and SCSI, and can access USB storage using USB-to-SCSI emulation drivers.checked 29 Sep 2026
- Drive operations
- Commands include low-level erase, sector reading and writing, bad-sector remapping, and changing drive size with HPA.checked 29 Sep 2026
- Hardware requirements
- The manual lists an Intel Pentium or higher, 4 megabytes of RAM, DR-DOS or MS-DOS 6.22 or higher, and a keyboard.checked 29 Sep 2026
- Intended users
- The manual says MHDD is not easy for users without deep knowledge of how disk drives work.checked 29 Sep 2026
- Purpose
- MHDD is a freeware tool for low-level hard drive diagnostics and management.checked 29 Sep 2026
- Scripting
- MHDD includes a simple scripting engine and supports batch files for running tests without an operator.checked 29 Sep 2026
- Support
- The product page links to an MHDD discussion forum, FAQ and documentation.checked 29 Sep 2026
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