Western Digital Corp. is making a forceful case for its bid to take control of Toshiba Corp.¡¯s memory-chip business amid a fierce bidding war.

The San Jose, California-based company is in talks with state-backed investment funds Innovation Network Corp. of Japan and Development Bank of Japan Inc. about options for a bid, said Mark Long, Western Digital¡¯s chief financial officer, during an interview in Tokyo. Long also suggested his company has held discussions with Apple Inc.

Western Digital became Toshiba¡¯s manufacturing partner in the flash-memory business when it acquired SanDisk Corp. for $15.8 billion last year. That investment is now under threat after Toshiba narrowed the list of contenders to a group that includes Western Digital¡¯s rivals, including Taiwan¡¯s Hon Hai Precision Industry Co., South Korea¡¯s SK Hynix Inc. and chipmaker Broadcom Ltd. Toshiba should negotiate with Western Digital first, Long said.