More than 2. VHS vs Beta, and the camcorder 8mm vs VHSC, Digital Audio Tape vs Digital Compact Cassette vs Minidisk (Sony had both DAT and Minidisk in that war), MultiMedia Compact Disc vs Super Density CD, which later rolled into VideoCD vs DVD, AudioDVD vs SuperAudioCD, MemoryStick vs SD and the other flash media, of course Bluray vs HD-DVD. Those eight are just the format wars Sony has participated that I can think of off the top of my head.
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