After partition recovery windows shows raw file system?!


I have a WD MyBook Essential 1TB, which device somehow deleted the existing partition (there was only 1). I was able to recovery all my files with R-Studio before using EASEUS Partition Master.
Now after the partition recovery - EASEUS told me it was successfull - the recovery softwers recognise my partition as an usual NTFS file system and both R-Studio and UFSExplorer can read the whole content without any further scans, but not the OS windows7. It shows RAW file system.
How could be solved this issue? (without formatting, so I don’t have to copy again 850GB data, since the MFT is probably ok)

Thanks in advance.

(firmware is the latest version, OS is win7)