Presale Questions:

Can DiskWarrior recover deleted files?

DiskWarrior is a directory repair tool which can rebuild a drive with a supported file system that is not mounting or physically failing.

Diskwarrior CANNOT recover deleted files, reformatted drives, or overwritten data.

You will need a deleted file program for such a recovery.

What file systems can DiskWarrior repair?

DiskWarrior can repair a macOS formatted drive. Supported Files Systems Include:

Mac OS Standard (HFS), Mac OS Extended (HFS Plus) with variations of Journaled, Case-Sensitive and Encrypted.


APFS (Apple File System) formatted drives ARE NOT currently supported

Please visit How To Identify an APFS disk to identify an APFS formatted disk.

Windows formatted drives are not supported including: NTFS / EXFAT / FAT32 / FAT16

Please visit the DiskWarrior Requirements page for more information.

Will DiskWarrior work on my external hard drive?

DiskWarrior 5 will attempt to rebuild the directory of a hard drive as long as it is formatted using the format of Mac OS Standard, Mac OS Extended, Mac OS Extended (Journaled) or Mac OS Extended (case-sensitive).

Macs can read from and write to a variety of disk formats and many external disks come PC formatted from the factory. Did you reformat this drive when you first used it or did you use the drive as is?

To double-check that the directory of the hard drive is readable by DiskWarrior in its current state, please open the Apple Disk Utility (located in any computer's Utilities folder or on the Apple Install CD/DVD under the Utilities menu or via the Recovery HD in Mac OS X 10.7.x Lion and later). Your drive should appear with two lines of data:

-- The first line should state the manufacturer of the drive (LaCie/G-Drive/etc) and the size in gigabytes (GB) or terabytes (TB).

-- The second line should be indented and have a volume name. This may be grayed out. This may not be the recognizable name of your drive. Instead you may see "untitled" or "disk1s2" (your specific numbers will vary).

Select the second line. At the bottom of the screen you should see the line "Format". If the drive meets the formatting requirements listed above, DiskWarrior will work to rebuild the directory of the drive. However, if the drive reads as PC Exchange, ExFAT, FAT16 or FAT32, NTFS (and more) then the disk is PC formatted and you will need to recover your data using a Windows-based utility while the drive is connected under a Windows operating system. If the format is blank, click on the Info button at the top of Disk Utility. In the window that opens there will be a line "File System". This may also give you the format of the drive.

DiskWarrior 5.x does not repair an APFS formatted drive.

For all publicly available information regarding DiskWarrior 5 and macOS 10.13 (High Sierra), 10.14 (Mojave), 10.15 (Catalina) as well as the new Apple File System (APFS), please visit DiskWarrior and High Sierra/Mojave/Catalina

If Disk Utility does not see the drive then there likely is a hardware failure. In this instance a data recovery company is likely your only option.

If only one line appears (no indented volume info), then the drive's partition map is damaged. In many instances DiskWarrior 5 can automatically repair the partition map of a drive. Even if DiskWarrior 5 cannot repair the partition map, additional assistance through Technical Support can result in manual repair of the partition map as a step toward recovering the data on the disk.

For further information; please visit the DiskWarrior Requirements page.

Will DiskWarrior work on my internal Startup Disk?

DiskWarrior 5 will attempt to rebuild the directory of a hard drive as long as it is formatted using the format of Mac OS Standard, Mac OS Extended, Mac OS Extended (Journaled) or Mac OS Extended (case-sensitive).

To double-check that the directory of the hard drive is readable by DiskWarrior in its current state, please start up the computer from the computer's built-in Recovery HD (restart and hold the Command + R keys on the keyboard). Once started, launch Disk Utility from under the Utilities menu. The drive should appear with two lines of data:

-- The first line should state the manufacturer of the drive (LaCie/Maxtor/etc) and the size in gigabytes (GB) or terabytes (TB).

-- The second line should be indented and have a volume name. This may be grayed out. This may not be the recognizable name of your drive. Instead you may see "untitled" or "disk1s2" (your specific numbers will vary).

Select the second line. At the bottom of the screen you should see the line "Format". If the drive meets the formatting requirements listed above, DiskWarrior will work to rebuild the directory of the drive. However, if the drive reads as PC Exchange, FAT16 or FAT32, NTFS (and more) then the disk is PC formatted and you will need to recover your data using a Windows-based utility while the drive is connected under a Windows operating system. If the format is blank, click on the Info button at the top of Disk Utility. In the window that opens there will be a line "File System". This may also give you the format of the drive.

If Disk Utility does not see the drive then there likely is a hardware failure. In this instance a data recovery company is likely your only option.

If only one line appears (no indented volume info), then the drive's partition map is damaged. In many instances DiskWarrior 5 can automatically repair the partition map of a drive. Even if DiskWarrior 5 cannot repair the partition map, additional assistance through Technical Support can result in manual repair of the partition map as a step toward recovering the data on the disk.

DiskWarrior 5.x does not repair an APFS formatted drive.

For all publicly available information regarding DiskWarrior 5 and macOS 10.13 (High Sierra), 10.14 (Mojave), 10.15 (Catalina) as well as the new Apple File System (APFS), please visit: DiskWarrior and High Sierra/Mojave/Catalina

For further information; please visit the DiskWarrior Requirements page.

Can I get my data off a failing hard drive?

DiskWarrior is the most capable recovery and repair tool on the market. Judging just from what the issue is, Mac-formatted failing hard drive, the odds are favorable that the data can be recovered by DiskWarrior.

Even if you can see your files in "Finder"; using "Finder" to move files from a failing drive is cumbersome and will frequently stop copying data, when it encounters bad blocks.

The more attempts made to retrieve the data, the more potential there is for the hard drive to fail permanently. Run DiskWarrior once, and be done!

One of DiskWarrior's main functions is to resolve this issue you are experiencing with transferring data from a failing hard drive.

DiskWarrior is much faster at transferring files and will ignore these bad blocks to get your data transferred to another source.

In the meantime, please do not run any other disk utility on this drive since it might erase critical information that DiskWarrior could have used as part of its repair.

Finally, as DiskWarrior is both an emergency recovery software as well as a preventative maintenance tool, there are many other types of problem that can be prevented by utilizing the DiskWarrior software on a regular basis.

Please visit the DiskWarrior Requirements page for more information.

I keep getting error code 36 when transferring files in Finder, can DiskWarrior help?

An error (-36) is an input/output error. A portion of a file resides on a damaged sector on a drive.

There are essentially two parts to accessing a file - the directory entry and the file data itself.

If the inability to copy comes from the directory entry, then running DiskWarrior may help recover the file.

If the problem is in copying the file data itself, then there is no software that can force the physically failing portions to provide the data and make the file accessible. However, DiskWarrior can be used to copy the remaining valid files from a failing disk.

There is no method to determine which is the cause of the problem for these specific files.

Does DiskWarrior work on Solid State Drives (SSD)?

The directory structure of a Solid State Drive, is the same as a more “traditional” hard drive - they both use HFS+ (Mac OS Extended).

As such, DiskWarrior can be safely used with an SSD device running a supported File System such as HFS+.

TRIM should be used and will have not have a negative reaction.

Please visit the DiskWarrior Requirements page for more information.

Does DiskWarrior work on Drobo?

Drobo does not have a proprietary file system. They simply have a system which constantly moves data around a disk, in a special fashion.

DiskWarrior can rebuild the directory of a Drobo that is formatted HFS+.

Please visit the DiskWarrior Requirements page for more information.

Please refer to the Drobo Support page regarding DiskWarrior: Drobo Support

What is the upgrade price for previous versions of DiskWarrior?

Thank you for your interest in upgrading to DiskWarrior 5. The upgrade price from earlier versions of DiskWarrior is $59.95 USD plus s&h. Visit the DiskWarrior Upgrade page for more information:.

If I order the DiskWarrior upgrade, will I be able to download the new software immediately?

When a new order is placed, the customer receives a brand new license with a brand new serial number. We do not have to verify any previous order details. However, when an upgrade order is placed, we must verify that the serial number is valid and that the registered owner is purchasing the software. It is these extra steps that cause a slight delay in processing the upgrade orders. Typically the software is sent via email by the next business day.

Please understand that we appreciate your continued support and are working as quickly as we can to process and ship all pending orders. If you have any further questions about ordering, please contact our sales department directly.

Sales Voice Toll-Free: 800-ALSOFT1, 800-257-6381 Sales Voice International: 281-358-4090 Sales Email: Sales.Info@Alsoft.com


General Questions from DiskWarrior Users:

How can I install DiskWarrior 5?

Please visit the Guides page in the Support section of our website for step-by-step video instructions.

How do I update the DiskWarrior software on my Mac?

Please visit the Guides page in the Support section of our website for step-by-step video instructions.

How do I create a DiskWarrior USB Flash Drive?

Please visit the Guides page in the Support section of our website for ste-by-step video instructions.

How do I update the DiskWarrior software on the DiskWarrior USB Flash Drive?

Please visit the Guides page in the Support section of our website for ste-by-step video instructions.

Where can I get my Serial Number if lost?

The DiskWarrior 5.0 or later Serial Number can be found on a white sticker inside the plastic case your USB shipped in. For earlier versions of DiskWarrior, the Serial Number would have been printed directly on the CD/DVD.

The Serial Number can also be located in the "About DiskWarrior" section of the application if you installed a serialized version.

Otherwise, please contact our Sales Department at 1-800-257-6381 (US Toll Free), at 1-281-353-4090 (International), or you can email them at sales.info@alsoft.com. If you purchased DiskWarrior directly from Alsoft or registered the software, the Sales Department can retrieve your DiskWarrior serial number.

I have lost my DiskWarrior USB Flash Drive / it no longer works. How do I get replacement?

There is a ninety day warranty on the DiskWarrior USB Flash Drive which we shipped to you. Otherwise, there is a small replacement fee of $21.90 for U.S. Customers / $25.90 for International Customers. This is available through our Sales Department at sales.info@alsoft.com or 1-800-257-6381

Note: If you reside in Texas, Sales Tax will apply to this purchase.

Alternately, using DiskWarrior Recovery Maker, you can create your own DiskWarrior USB Flash Drive, by supplying your own 2GB (or larger capacity) USB Flash Drive.

You can then launch DiskWarrior Recovery Maker and click the Create button to create the device.

If you need a copy of DiskWarrior Recovery Maker, it can be downloaded at the DiskWarrior Recovery Maker Update page.

My DiskWarrior USB Flash Drive is corrupted. How do I recreate it?

In the confirmation email you received, upon purchasing DiskWarrior, there are instructions on how to resend the current DiskWarrior application to your supplied email address. Visit the DiskWarior Resend page to resend the DiskWarrior application to your email.

Remove the installed DiskWarrior and reinstall the software.

Now that you have DiskWarrior 5.2 installed, please launch and serialize the application.

Then, for the USB Flash Drive...

Using Disk Utility, first erase the DW partition of the USB Flash Drive. Copy the contents of the downloaded disk image, to this partition.

Next, please launch DiskWarrior Recovery Maker from the downloaded image file to recreate the USB Flash Drive. To do so, launch DiskWarrior Recovery Maker and click the Create button.

Once you have updated the USB Flash Drive, use it to start up the computer, holding the Option key, rather than Command + R. You will see DiskWarrior in the application list from which you can launch and run DiskWarrior.

What to do regarding ".plist" files found to be damaged in the DiskWarrior Files Test.?

Move the ".plist" files to the Trash and empty the Trash.

If the host/parent application requires, it will recreate the file when needed.


Warning Messages in DiskWarrior:

System Extension blocked. Cannot find "Allow" button.

Please restart the computer.

Launch DiskWarrior. Do not open any other applications or windows.

Once the dialog appears about Security, only now open the System Preferences.

Go to the Security & Privacy Panel.

Click on the General tab.

You will need to click the lock (in the lower left corner) to unlock the panel, and then you can click Allow.

Now quit System Preferences and re-launch DiskWarrior.

"Directory cannot be rebuilt because this is the startup disk." when Startup Disk is selected in the Rebuild list.

To rebuild the computer's main drive, you must start up the computer from another source. There are many options to do so.

The downloaded software will not start up your computer since it does not include any System files.

You will need to utilize one of the following configurations to use the current DiskWarrior 5 application (please read carefully as not all of these may be relevant for your configuration):

(1) Alternate Startup Disk

If you have an external drive such as...

FireWire (PowerPC or Intel) USB2 or newer (Intel only) Thunderbolt (Intel only)

(2) Or a secondary internal drive or partition...

You can download and install the current macOS version from the Mac App Store on that drive and start up the computer from the operating system on the external/secondary device. Once you have started up the computer from the newly-installed operating system, install DiskWarrior into the “Applications” folder. Then, you can launch DiskWarrior from the Utilities folder of the external/secondary device to rebuild the directory of the computer's main hard drive.

Please review the following link to see how to utilize the downloaded macOS Mojave to install the operating system onto an alternate drive:

https://support.apple.com/en-us/HT201372

(3) Target Disk Mode: Connect two Macs with a FireWire or Thunderbolt cable (not all options will be applicable depending on the model of your computer) where one is the “host” and the other is a “target”. The host Mac should be running OS X (10.5.8 "Leopard" or higher). In this scenario, the target Mac is the computer whose internal hard drive you want to repair. Start by shutting down the target Mac. Then turn it on while holding down the “T” key. The target Mac’s drive will appear as an option via the DiskWarrior interface. Run DiskWarrior from the Applications folder of the host Mac and rebuild the target Mac’s disk.

(4) Internet Recovery Mode using Terminal Command.

Hold Option-Command-R after you turn on the computer. Wait for a spinning globe to show up and the progress bar to load. This can take a while. Go to Utilities listed in the top Menu bar. Open Terminal. Enter /Volumes/DW/Go

What is the "File system is a newer version" message in DiskWarrior.

The drive has been converted to the new APFS file system. DiskWarrior 5.x does NOT repair an APFS formatted drive.

Just like every other file system, operating system, and processor change, DiskWarrior will be updated for the new technology.

Only recently, has Apple provided their developers with the "Read" portion of the documentation regarding APFS. Now that this is available, the development team is working to complete the upgrade, but will need the "write" documentation to be released before upgrade can be come available.

For all publicly available information regarding DiskWarrior 5 and macOS 10.13 (High Sierra), 10.14 (Mojave) amd 10.15 (Catalina) as well as the new Apple File System (APFS), please visit DiskWarrior 5.2 and APFS

"Speed reduced by Disk Malfunction" message

As long as the mouse cursor still moves during step 5, then the computer did not hang or freeze. DiskWarrior is still working on reading the directory of the disk.

The "speed reduced by disk malfunction" message indicates that there is a communication problem with this hard drive. Such slowdowns are usually the result of having bad blocks on the media. DiskWarrior is having trouble reading data from the locations on disk where the directory structures are stored.

While the application is running, you should see the number of errors increase in the counter, just to the right of the message. The number may not increase at a steady rate as not all of the blocks will be bad.

To recover the data from this drive, please let DiskWarrior continue to run. This can take quite a few hours but should eventually complete. We suggest giving the software up to one week to recover the files from a hard drive in this condition. Over one week you would want to send the drive to a data recovery company such as Drive Savers .

Since the "speed reduced by disk malfunction" message indicates hardware-related issues, you will not be given the option to click on the Replace button when DiskWarrior reaches the Report window. Instead, you will need to backup your files from the DiskWarrior Preview window (accessed from the DiskWarrior Report window) to another hard drive. Once you have a backup of your files, you will need to install a new hard drive to replace the damaged hard drive.

"Directory cannot be replaced due to Disk Malfunction" message in report.

In the lower left corner of the DiskWarrior Report, you will see a Preview button. Click Preview.

This will launch the DiskWarrior Preview application. This will show two windows side by side.

In one window, select the Preview version of the damaged hard drive.

In the second window, select a secondary hard drive (connected via USB, FireWire, another internal hard drive, etc.). If this is an external hard drive, make certain the hard drive is formatted for the Macintosh (HFS+ also known as "Mac OS Extended").

Since the hard drive is physically failing, you will need to be gentle while copying files from the damaged hard drive. Copy small batches of files. Copy the important files first.

When trying to recover files from a physically failing drive, the larger the amount of data trying to be transferred in one pass, the more likely the drive will slow down or fail.

Once you have a backup of your files, you will need to install a new hard drive to replace the damaged hard drive.

"Offline, Unavailable, CoreStorage Disk" message in Drive list of DiskWarrior.

When you're in the main DiskWarrior window, click the Unlock button located toward the upper right corner of the DiskWarrior interface.

You will be asked for the computer password. Once the password is entered, the drive will be available for repair.

"Directory cannot be replaced because the Serial Number is no longer valid" at report, after DiskWarrior Rebuild.

The computer's date is set incorrectly.

Restart the computer and hold Command + R. This will start the computer from the built-in Recovery HD.

Once the computer has started, select Terminal from under the Utilities menu bar option.

When Terminal opens, type the following:

date 0813044419 (MM/DD/HH/MM/YY)

Then press Return.

Now type /Volumes/DW/Go

Again press Return.

DiskWarrior should now run successfully.

DiskWarrior has a fail-safe method of replacing the directory. Once the directory has been rebuilt and you decide to replace the directory DiskWarrior writes the original directory to another area of the disk. When the original directory has been written to another area of the disk DiskWarrior assigns a pointer to this copy of the directory and makes it the active (current) directory, then precedes to replace the original. Once the original directory has been replaced with the new rebuilt directory DiskWarrior takes the pointer from the old directory and points it to the new directory.

Fail-safe replacement is a safety mechanism just in case you have a power outage or someone pulls the plug on the machine, your original directory is still the active directory.

You may have sufficient free space but it is not contiguous. Since you do not have enough contiguous free space to write the original directory to another location DiskWarrior cannot perform the fail-safe replacement.

IMPORTANT: This might mean that your hard drive is very full, or was very full at one point in the past.

With little free space remaining on a drive certain problems occur:

-- The operating system cannot allocate virtual memory easily. If this is a hard drive that contains an operating system, the speed of functionality will diminish.

-- Data corruption can occur.

A generally accepted rule is to never have less than ten percent (10%) free space on a hard drive. If the drive contains an operating system, you should keep at least fifteen percent (15%) free space. In both instances, the free space should be no less than 10GB even if this is more that ten or fifteen percent.

You have two options:

(1) You can get a utility to defragment your disk. However, the act of regularly scheduled defragmentation, while useful in older operating systems, is generally an obsolete practice when running Mac OS X 10.3.x and newer.

Thus a better option is...

(2) Continue replacing the directory without the fail-safe feature and hope the power does not go out. In this case, now (prior to replacing the directory) would be a perfect time to make an updated backup of your drive, or a first backup if you have no copy of your important files. Then, continue with the replacement of the directory.


Error Code Questions:

Error "The Application DiskWarrior 5 Installer can’t be opened."

Open the downloaded image file.

Open the "Installer Items" folder.

Take the DiskWarrior application in this folder, and move it to the Applications folder of the computer's main hard drive.

Double click on the DiskWarrior application you just moved into the Applications folder.

Error (-1700) / (-1743) when installing DiskWarrior

Open the downloaded image file.

Open the "Installer Items" folder.

Take the DiskWarrior application in this folder, and move it to the Applications folder of the computer's main hard drive.

Double click on the DiskWarrior application you just moved into the Applications folder.

Error (2154) when rebuilding with DiskWarrior 4.X

The (2154) message indicates that the size of the directory of this disk is too large for the available memory space in DiskWarrior 4.x.

DiskWarrior 5.2, a fully 64bit version of the software, is now available. A 64bit application can utilize more memory, and in turn rebuild and repair the directory of disks with larger directories.

In addition to 64bit architecture, DiskWarrior 5 can be launched from an OS X Recovery Disk (Recovery HD), can repair GUID partition tables, rebuilds Time Machine disks, has even more improvements to help recover data from physically failing disks, and is the only repair utility that still supports PowerPC computers.

DiskWarrior 5 supports both PowerPC and Intel Macs started in OS X 10.5.8 Leopard through macOS 10.15 Catalina. Apple File System (APFS) disks are not currently supported.

DiskWarrior 5.2 ships on a USB Flash Drive. Utilizing our new DiskWarrior Recovery Maker application, this USB Flash Drive can easily be turned into a startup device from which you can run DiskWarrior to repair the computer's main drive.

For more information please visit the DiskWarrior Requirements page:

For owners of DiskWarrior 4.x, the Upgrade to DiskWarrior 5 is available for $59.95 - half of the price of a new copy of the software.

The Upgrade can be purchased by visiting the DiskWarrior Upgrade page. Alternately, please call our Sales Department at 1-800-257-6381 (US) or 1-281-358-1510 (International). They can also be reached at sales.info@alsoft.com.

Error (2020: 256) When Booting from DiskWarrior 4.x

This Mac will require the new DiskWarrior 5 which ships on a USB Flash Drive.

DiskWarrior 5.2, a fully 64bit version of the software, is now available. A 64bit application can utilize more memory, and in turn rebuild and repair the directory of disks with larger directories.

In addition to 64bit architecture, DiskWarrior 5 can be launched from an OS X Recovery Disk (Recovery HD), can repair GUID partition tables, rebuilds Time Machine disks, has even more improvements to help recover data from physically failing disks, and is the only repair utility that still supports PowerPC computers.

DiskWarrior 5 supports both PowerPC and Intel Macs started in OS X 10.5.8 Leopard through macOS 10.15 Catalina. Apple File System (APFS) disks are not currently supported.

DiskWarrior 5.2 ships on a USB Flash Drive. Utilizing our new DiskWarrior Recovery Maker application, this USB Flash Drive can easily be turned into a startup device from which you can run DiskWarrior to repair the computer's main drive.

For more information please visit the DiskWarrior Requirements page

For owners of DiskWarrior 4.x, the Upgrade to DiskWarrior 5 is available for $59.95 - half of the price of a new copy of the software.

The Upgrade can be purchased by visiting the DiskWarrior Upgrade page. Alternately, please call our Sales Department at 1-800-257-6381 (US) or 1-281-358-1510 (International). They can also be reached at sales.info@alsoft.com.

DiskWarrior Rebuild error (2175)

The (2175) error indicates that some problem with your drive occurs when DiskWarrior attempts to fix the file overlaps. You’ll have to re-run DiskWarrior. When you get the report, save the report to another drive. Then manually delete each overlapped file using the Finder (if possible) or another file management utility. After this, rebuild the drive once more with DiskWarrior and see if you can complete the directory replacement.

There is no definitive explanation for why files get overlapped. To avoid this kind of problem in the future, we recommend running DiskWarrior more often. We suggest running it at least once every two to three weeks. Also, never run any other disk utility before running DiskWarrior.

Error (2153, 4901: 753) when attempting to rebuild a drive in DiskWarrior.

Disconnect the drive you are trying to rebuild.

Go to the DiskWarrior Menu bar at the top of the screen.

Select "Disallow mounting of disks" in the Special Options Menu.

Then reconnect the drive.

Press the "Command" + "R" Keys together to refresh the drive list in DiskWarrior.

Now select the drive in questions and click "Rebuild".

Error Message: "DiskWarrior encountered an unexpected error. If you report this error, please mention the error code (4010 : 716)."

Likely, you have a third-party haxie enabled on your computer, such as WindowMizer, MenuEverywhere, Default Folder X, MenuPop, KeyCue, Dragon Dictate, CleanMyMac, Monolingual or others.

Third-party applications that attempt to inject/modify code into another company's software, can always cause potential problems. If you have applications installed that have exclusion lists so as to prevent the software from modifying other applications, please add DiskWarrior to the Exclusion List.

However, the best solution here is to run DiskWarrior Recovery Maker, and create a USB startup disk from which you can run DiskWarrior. This will ensure no applications are interfering.

Error (824) when running DiskWarrior Recovery Maker.

The error (824) indicates another application or utility is accessing the USB Flash Drive while DiskWarrior Recovery Maker is working with it.

Please run this again from Safe Boot:

Shutdown the Mac.

Startup the Mac holding the "Shift" key until you get a progress bar.

Once booted, log into the Mac.

Then, run DiskWarrior Recovery Maker again.

Error (822) when running DiskWarrior Recovery Maker.

The security settings of the computer are interfering with DiskWarrior Recovery Maker.

Please visit this link: https://support.apple.com/en-us/HT208330

Using that link, follow the instructions to start up the computer, and then change the settings to allow external media and no security.

Once you have modified the settings, restart the computer and run DiskWarrior Recovery Maker again. The process will complete as expected.