Low-level Hard Drive Diagnostics Freeware: MHDD

MHDD is the most popular freeware application for low-level HDD diagnostics.

MHDD Interfaces Supported:
MHDD supports these interfaces: IDE, Serial ATA, SCSI. Also there is a possibility to access an USB storage, there are drivers for emulation (USB->SCSI).

What can MHDD do?
This software can make precise diagnostic of the mechanical part of a drive, view SMART attributes, perform Low-level format, bad sector repair, different tests and tens of other functions.


· Intel Pentium or higher CPU
· 4 megabytes of RAM
· DR-DOS, MSDOS version 6.22 and higher
· Any boot device (USB, CDROM, FDD, HDD)
· A keyboard

IDE/SATA Controllers:

· Any integrated into motherboard north bridge (addresses: 0x1Fx for primary channel, 0x17x for secondary channel)
· PCI UDMA boards (detected automatically): HPT, Silicon Image, Promise, ITE, ATI and so on. Even some RAID boards are supported. In this case MHDD works with each physical drive separately
· UDMA/RAID controllers integrated into motherboard as additional chip

Hard disk drives:

· Any IDE or Serial-ATA drive with size bigger than 600Mbytes, in other words, LBA mode is supported in full.
· Any IDE or Serial-ATA drive with size lower than 8388607 TBytes, in other words, LBA48 mode is supported in full
· Any SCSI drive with sector size 512-528 bytes
· Any SCSI removable media such as tape, CDROM. Maximum sector size for such devices is 4096 bytes

What’s New in MHDD v4.6?

· Fixed rare hangs when working with slave device
· Fixed TOF/ATOF problem with determining maximum file size when operating with SCSI devices
· Fixed displaying firmware version instead of serial number in SMART ATT
· Added PCI device ITE 8211 PCI IDE
· Added PCI device VIA VT6421 IDE RAID
· Fixed several issues with some modern BIOSes
· Jumps while scanning now logged properly
· Resets (“R” key) while scanning now logged properly
· ASPI drivers now have latest versions

Related Links:

· MHDD Documentation
· Change log
· Magic Boot Disk with MHDD

MHDD Free Download:
MHDD 4.5 (older version, but includes ATA/SCSI Terminal)
· MHDD 4.5, self-extracting floppy image

· MHDD 4.5, CDROM iso-image
· MHDD 4.5, just-an-archive (MS-DOS executables only, no SCSI support)
· MHDD 4.6