After connecting my iscsi F-drive from one pc to another it was no longer recognised being formatted as NTFS so Windows asked if I wanted to format the F-drive (strange because I did not touch the data ...)
I went to the command prompt and did:
D:\> CONVERT F: /fs:ntfs
Where F: is a name of the drive you want to convert. It reported back that the drive was already NTFS.
I than ran: chkdsk F: /F which fixed it. After that it was immediately accessible as a normal Drive including all the data.