Toshiba Corp. filed a lawsuit against its business partner Western Digital Corp. on Wednesday, seeking a court injunction to end the U.S. firm's efforts to block the sale of a chip unit to a consortium led by Japan, U.S. and South Korean investors.

Toshiba is also claiming damages worth ¥120 billion in a separate suit filed with the Tokyo District Court.

"Western Digital has continually interfered with the bidding process" while spreading false information that Toshiba cannot sell the memory business without consensus from Western Digital's subsidiary, Toshiba said in a statement.