https://bugs.winehq.org/show_bug.cgi?id=42104
--- Comment #3 from AshleyJade k638540@mvrht.com --- I've managed to create new NTFS and EXT3 partitions on Ubuntu Server 14 LTS. As I predicted - there is no delay while "calculating the checksum" at all. Only EXT4 filesystem makes problem.
Of course I am not demanding any changes from Linux team in EXT4 code, this is clearly Wine's problem, Wine's relationship with EXT4 and WinRAR.