When Recuva failed to scan disk drives, it means it is unable to recognize the hard disk drive or Recuva unable to open portable usb or sd card that has no file system information or the MFT is lost. That is to say Recuva is unable to recover raw drive or when its MFT is deleted by virus or unknown causes. See the following image that shows the exact warning message from Recuva.
When Recuva shows the errors message telling it failed to scan/open drives, here are some causes for the failure.
recuva failed to scan the following drives unable to determine file system type
Here are some changes that you may get Recuva read the drive.
This can be done in Windows computer disk management. You may remove the old drive letter at first, and then assign a new driver for it ; or you may directly change the drive letter to assign a new drive letter to it.
Video - how to change drive letter in disk management
If Recuva still cannot scan your drive, you may do the following.
This formatting would help change the drive to be recognized by Recuva. It's the way that would help. However it may increase the difficulty of data recovery for Recuva. If you care more about your data on your storage drive, we would recommend use the #3 solution instead.
Note: formatting would erase all data on the drive.
You may try format the drive with a right click format option when you open THIS PC, and when the drive shows up in file explorer, you may do the formatting.
Note: There are many ways to do the formatting. -> Format usb in 4 ways
Also read: how to recover sd card without formatting
When Recuva failed to scan your drive, you may try the following free alternative that can help restore files from drives when Recuva failed, especially when the drive became raw, the hdd/usb/sd file allocation table MTF is lost, or had unknown/unsupported file system that has been damaged by virus, bad blocks, or other logical damages.
Note: The RAW DRIVE RECOVERY in the software would help retrieve files from various kinds of data losses including file system missing, MFT missing etc.
The error message from Recuva: Failed to scan the following drives, unable to determine file system, itself delivers the information that we can get it fixed by using a program that can help restore drives when the tool can see the drive that has no file system information.
This can be done in device manager under Disk drives with a right click -> Uninstall option to get the drive uninstalled at first.
Note: Device Manager can be accessed by this route: Right click THIS PC on desktop -> Manage -> Device Manager.
And then restart pc, insert drive or external device to pc, come back to this device manager, and then click Action -> Scan for hardware changes to get it loaded again.
Video - how to update drive in device manager in Windows 10
Or you may also uninstall drive and reinstall it under disk management with a right click option -> Change Drive Letter and Paths... -> Remove; and then Create
If the drive letter cannot be changed in disk management, you may use cmd to get it changed.
This following example is the command lines to get drive H changed to G
If there are some other tools that are using the drive, Recuva may fail to scan the drive. At this time, close all other software, for example, stop the scanning of your Anti-virus software.
If the app did not respond, you may get it closed under Task Manager right click -> End task.
And then reopen Recuva to see whether it can scan your drive. If it failed, try the following.
When Recuva failed to scan the disk drive or storage media, you may use Windows error-checking tool to get it repaired at first to fix the unknown file system, especially the raw drive. This can be done by the following route:
If it still does not work, convert raw drive to ntfs, or convert raw drive to fat32
Administrator privilage is required. If you are running Recuva in a non-admin mode, you need to restart your pc and go to the Administror mode to use it since the software would ask access permission from computer devices.
Running Recuva in Windows safe mode needs a restart of pc and then enter the safe mode before the computer booting into its OS.
Note: You may search which key on your keyboard is to enter the safe mode since different brand of pcs especially the laptops may have different key to enter into their safe mode.
Video - how to boot into safe mode
These changes are the fixes you can make without formatting if you do not want to risk losing your data.
Question: Recuva unable to open drive
Answer: When Recuva failed to scan drive, it means the program is unable to open the drive for scanning. It could be the logical error or drive is damaged and cannot be recognized in computer, or it could be the reason the drive is not supported by Recuva.
Question: Recuva unable to open the recovered files
Answer: If the recovered files from Recuva is damaged, or it has not been correctly restored, the files would not open and show weird symbols.
Also read: Why recuva recovered files not opening