It's being reported that Sony is closing Optiarc Inc., its company subsidiary that manufactures optical disc drives for PCs. Officials are quoted as saying that "fierce competition" forced prices down, causing the business to operate at a loss despite controlling roughly 15 percent of the market. Operations will be wound up by March of next year, with around 400 employees being offered early retirement and others being moved to other parts of the business. Don't worry about the future of your Blu-Ray and DVD player just yet though -- the company will continue to manufacture both as part of its Device Solutions Division.