Product Watch: Another Important Weapon In Your Disk Repair Arsenal


DiskWarrior 2.0

Alsoft's DiskWarrior is a utility designed to prevent and eliminate directory damage to your Mac's hard disk. Its DiskShield component checks the integrity of any data being written to or from the directory to prevent errant programs from destroying the directory and to alert you to any existing directory damage. Directories are continuously kept up-to-date so that if you experience a crash or loss of power, potential loss of data is eliminated, according to Alsoft.

DiskWarrior takes a different approach to maintaining disk integrity. Instead of patching the original directory it builds a new replacement directory using data recovered from the original directory. Alsoft says that this procedure leads to better data recovery and is a similar procedure to rebuilding the desktop files.

The program does not attempt to repair all the possible problems that can occur with a disk, but is specifically directory orientated. Directory errors are the most common problems that bedevil Mac disks. This includes fixing problems with the master directory blocks and alternate master directory blocks (HFS), volume headers and alternate volume headers (HFS +), volume bit maps, catalog trees, and extents trees.

Alsoft feels that their product is superior to the competition because it looks at the whole directory rather than approaching it piecemeal. Other disk repair utilities try to repair the directory one step at a time, while DiskWarrior tries to replicate it completely. At the end of the process the directory is not only rejuvenated but optimized as well. Alsoft says such directory optimization results in a 50% - 60% decrease in the amount of time it takes a program to scan the directory and a 10% - 20% decrease in boot time.

What is directory damage

The directory is the portion of your disk set aside to record the names and locations of your files and folders. When your directory is either incorrectly updated or not updated at all, your directory is damaged.

An errant program can damage your directory by inadvertently writing its own data to the portion of the disk that is reserved for the directories. If your Mac crashes or loses power, updated directory information that the Mac OS caches in memory for faster access never gets written to your disk, resulting in potential directory damage. The presence of directory damage may be very minor or it could make some or all of your files inaccessible.

DiskWarrior comes on a CD-ROM and will boot any Mac from a 68020 up to the recent G4 Macs. The CD has three system folders on it; OS 7.6, OS 8.1 and OS 9. It will automatically use the correct OS for your Mac.

A recent MacUser UK review gave DiskWarrior 2.0, 4 1/2 mice out of a possible 5 and said this:

"In the space of a year, Alsoft's DiskWarrior has transformed itself from an upstart challenger to Norton Utilities and TechTool Pro into a vital weapon for Mac systems administrators and home users alike."

DiskWarrior Suggested Retail Price : $69.95 Upgrade Price: $29.95

Toll-Free: 800-257-6381


Essential Facts

System Requirements:

  • 68020 processor or later, or any PowerPC.
  • Mac OS 7.1 or later, including Mac OS 9 (You must be started from Mac OS 8.1 or later to rebuild HFS Plus (Mac OS Extended) disks).
  • 16 MB RAM (more RAM may be required for large directories).
  • DiskWarrior supports SCSI, IDE, FireWire, and USB devices and is compatible with any storage medium formatted as a Macintosh disk.
  • In order to load the DiskWarrior Extension and use the DiskShield technology incorporated within it, the operating system version must be Mac OS 8.1 or later.


  • Prevents disk damage with nonstop disk protection.
  • Recovers lost files and data.
  • Removes unseen directory errors, preventing minor directory errors from escalating into major problems.
  • Eliminates risk of losing access to files. Other disk "repair" utilities attempt to fix directory by patching directory structure and risk deleting sections of the directory.
  • Optimizes directory for maximum directory performance, speeding up overall disk performance.
  • Uses directory data to quickly rebuild the directory structure instead of patching the old directory.
  • repair preview, allowing you to test files, folders, and applications before any directory changes are written to disk.
  • Verification of rebuilt directory ensures data integrity.
  • Scavenges directory data to find all salvageable file and folder data, even those contained in damaged nodes.
  • Supports Mac OS Standard (HFS) and Mac OS Extended (HFS Plus) disks.
  • Designed to safely permit interruptions of any kind, including power outages.
  • Support for bad block sparing software.
  • Rebuilds disks as large as 2,000 gigabytes (2 terabytes).
  • Accelerated for Power Macintosh.

External Links


For Free Macintosh Hardware Click Here