Support Center

In most cases, the reason for ".DMG Corruption" error on Mac is because the downloaded dmg file is actually corrupt or had an error downloading. Please kindly try the following methods:

1. Try downloading the dmg again, and turning off any download assistant plug-ins you may have. You can try to download the file in a different browser as well.

2. Reboot your Mac. Apparently, there is an issue sometimes after opening too many dmg files, which can be solved by a reboot.

Please kindly try the following methods:

1. Disconnect all USB external storage devices from the machine and try again.

2. Click here to Download and Reinstall ONERECOVERY to have a try.

Hard drive Requirements on Windows:

500 MHz processor or faster;

A minimum of 1 gigabyte (GB) RAM; A minimum of 2 GB RAM for Window;

A minimum of 100MB of available space on the hard disk;

Keyboard, mouse and other compatible pointing devices.

Hard drive Requirements on Mac:

500 MHz processor or faster;

A minimum of 1 gigabytes (GB) RAM; A minimum of 2 GB RAM for MacOS;

A minimum of 100MB of available space on the hard disk;

Keyboard, mouse and other compatible pointing devices.

We support various file formats of photo, video, audio, office file, document, outlook & Archive. Please click here to find more information about the file types supported by ONERECOVERY.

Please kindly check the following tips:

1. Make sure the hard drive power light is flashing;

2. Try to connect the hard drive to the PC via the ports on the back of the computer;

3. Update or reinstall your drivers.

Please kindly check the following tips:

1. Check whether your card reader is working properly;

2. Check the USB interface. If there is a connection problem, please kindly change a new USB port;

3. Check whether your SD card has mechanical damage (left in a humid environment) or logical corruption.

For Windows:

Open Disk Management to check the status of this drive. Click the Menu button on ONERECOVERY at the top right corner - Disk Tools.

Case 1: The device is “No Media”

The hard drive was damaged. You should send the drive to a store to fix the issue. Then use ONERECOVERY to recover files.

Case 2: The issue with the USB Port or USB Cable

If it is an external device and cannot be detected by Disk Management at all, please make sure the USB cable is good. You could change a USB cable to connect it.

If it still does not work, the USB port you are using must be dead. Unplug your device and plug in it in some other USB port, like the BACK port of the desktop.

Case 3: The device is Not Initialized

Generally, Windows System will show you a pop-up window when you connect the drive with Not Initialized issue to your computer. Disk unknown not initialized can be caused because of virus attack, corrupted Master Boot Record, partition loss, bad sectors, some computer file system corruption and more.

Warning:

Disk initialization will clear all the data on your hard drive storage and case data loss. So if you have stored a large number of important files, it is not suggested to do this operation.

If you are sure to initialize your device, please click Initialize in the pop-up window or Disk Management to initialize the drive.

1. Click “Win + R” and input “compmgmt.msc” to open the Disk Management.

2. Select the Not Initialized disk, then right click, choose “Initialize Disk” to initialize the disk to directly solve this problem.

For Mac:

Case 1: The device is Grey out

It's probably hidden for some reasons, right click this drive and choose Mount option to mount this drive, then check if it can be detected.

Case 2: Repair Disk

If the method one does not work, please try to repair the disk using Disk Utility on Mac.

1) Open the Disk Utility.

2) Choose View, Show all Devices.

In the sidebar, select the disk you want to repair.

1) Click the First Aid button.

2) Click run to check your Disk and try to repair it.

Case 3: The issue with the USB Port or USB Cable

If it is an external device and cannot be detected by Disk Utility at all, please make sure the USB cable is good. You could change a USB cable to connect it. If it still does not work, the USB port you are using must be dead. Unplug your device and plug it into another USB port, like the BACK port on your desktop.

If the drive still cannot be detected in Disk Utility, please check the power supply. Single USB ports can provide only 5 V. In that case, make use of USB cable having one USB connection for the external drive and two for Mac. This will supply the power required by the external hard drive.

1. Please confirm whether your disk and computer are well connected;

2. You can try to replace the USB cable and USB interface, and then continue scanning;

3. You can use third-party disk tools to check if your disk is in good condition;

4. If the problem persists, you can pause the scanning progress and select the scanned file for saving and recovery.

If those steps do not help, please contact support.

This error is mainly caused by an unstable connection during the scan, or the failure occurred when our product was trying to read the sectors on your hard drive. Please follow the steps below to fix it:

1. Safely remove your storage device and reconnect it. Please make sure not to close our program when you try this method.

2. Switch to another USB port or change a new cable.

If your Mac is running MacOS 10.15 and the above version, please check if the Removable Volumes option is selected, you can go to Security & Privacy to set it up. After that, please restart the program to scan your data.

Please follow the steps below to troubleshoot the reason that causes this issue:

1. Normally the deep scan can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions. It is normal if your scanning time is in this time range. Please wait patiently and do not stop the scan in the middle of the process.

2. If the scan time is longer than the normal time, please check if the hard drive is disconnected from the computer, especially for external ones. Please change a new cable to do the recovery again if disconnected.

3. If the scan time is longer than the normal time, it is also suggested that you pause the scan and then recover the files that have already been found to your other drive and check if they are what you need.

4. In this case, your hard drive may contain serious physical errors (such as bad sectors, and bad tracks). Please use a professional tool such as HDTune to diagnose your hard drive. If the diagnosis shows physical error, you may need assistance from a local data recovery lab.

For reliability, these files without correct file names or folder structures will be found in unsourced files and file lost location while the file directory info has been damaged. If the recovered files with correct file names cannot be opened or they cannot be found by file names or folder structures, please check each file with random names to retrieve lost data.

We adopt several different scan methods to ensure a better scan result.

1 file could be detected by multiple scan methods and each method will create 1 copy of the file in the scan result, so it is normal more files found than you actually have. You may just try them one by one, and save the copy that can be accessed correctly.

When ONERECOVERY finds a file system track, after scanning it will show it as a partition no matter whether the file system is intact or not.

For example, if it finds 10 file system tracks, it will show 10 partitions. But some partitions in your system are hidden, so you will find some partitions that are not shown on your computer explorer.

ONERECOVERY is a user-friendly data recovery software with comprehensive recovery tutorial. You can click here to find out how to recover data from a crashed computer.

In general, there are 3 causes for the issue that recovered files can't open:

1. The path chosen for restored files contains mistakes. In this instance, please right-click an individual file and restore it to the drive's root directory to check if it can be opened. If you previously closed the programme, you can relaunch it, select the function that was used to scan the drive, and load prior scanning findings.

2. Errors occurred during the scan. In this case, please rescan the drive and save an individual file to see whether it can open.

3. The file format is incorrect. Some file formats of the recovered files may not be compatible with the OS or the program you use to open them.

4. The file got damaged before recovery. ONERECOVERY can only recover lost/deleted files but can't repair damaged files. You should check whether your file is accessible before recovery.

There're 4 cases related to this situation. Check them below:

Case1: Save Failure due to Lack of Space

The system fails to save the recoverable files due to the lack of free space.

Please check the free space of the drive.

Try to save the recoverable files to another storage device.

Case2: Save Failure due to the Wrong File Path

There are errors in the path selected for recovered files. In this case, please right-click an individual file in ONERECOVERY and recover it to the root directory of a drive to see whether it is there.

Case3: Scan Error

During the scan, errors occurred. In this instance, please rescan the drive and save a single file to test if it can be opened.

Case4: Wrong Target Path

The file system of the drive you used to save recovered files isn't supported by Windows. Please try to save files to an NTFS or FAT32 partition.

Video storage generates a significant number of fragments because of its unique discontinuous (fragmented) storage technique.

Photo/Video recovery utilizes a discontinuous storage video recovery technique, which may require two sequential disc readings and a limited number of random disc reads, thus it will take a long time.

This technique is primarily intended to address the issue that the video cannot be played after recovery due to discontinuous storage, hence improving video recovery quality.

There will be free data space when a file is erased. You still have an opportunity to scan and recover your deleted data. However, if you continue to enter data into the same disc, the system will store new data in any free spaces at random.

The original data gets covered and deleted forever once the free area is filled with new data. The data recovery software cannot scan or retrieve the original data.

Therefore, please save all recovered data to a secure storage device to avoid data loss again.

File Information=Files Directory + Data Field.

If any damage occurred in the file directory or the data field, it would be difficult to preview or open the recovered files.

If files directory and Data Field are intact, data recovery tools will easily recover the lost files by searching File Directory of the partition and the recovered files will have original file names and folder structures.

However, if the file directory is corrupted as a result of a change (reformatting, system reinstallation, partition/drive showing as Raw Status, or other changes, etc.), the Files Directory will no longer lead to the correct Data Content. Consequently, in this scenario, the data recovery programme cannot find valid information by searching the File Directory. That is why you cannot locate the missing file using the original file name and folder structure. Alternatively, the restored files retain their original file names and folder structures but cannot be opened.

If the program stops working or get frozen, we need to check both the program and the storage device. Please kindly check by following the below steps:

1. Check the scan is dead or not （Sometimes is just very slow but not frozen).

Please close other applications including antivirus and firewall to free up more memory space. Usually, this will speed up the scan.

2. The scan process stops responding

Please pause the scan and select the files to recover them. If the recovery prompts Recovery Failed or the recovered files are all 0KB, you need to keep running the software, then disconnect the drive and reconnect it. After that, please try to save the files again.

It's also suggested to change a much more powerful USB cable to make sure the connection of the drive is always stable during the scan. It's recommended to use a USB Enclosure which has its own power cable to connect the drive.

3. Recover data before the errors happen

4. Check whether the hard drive has hardware issues

Bad sectors on a hard drive will prevent software from reading the drive normally and usually result in a frozen issue. Please check if the hard drive really contains some bad sectors or other physical errors.

5. Contact us through email