The new guidance is a downward revision, it seems the transition to SSDs is going faster than Nidec anticipated, and there's also a headwind caused by weak market demand.
According to Nidec's data, unit sales of hard drives declined by around 43% from 2010 to 2018, going from around 650 million units in 2010 to 375 million units in 2018. And it looks like sales will continue to drop in the coming years. Recently Nidec revised its HDD shipment forecast downwards from 356 million drives to 309 million drives in 2019, which will further drop to 290 million units in 2020. The recent drops in HDD shipments have already forced Nidec to optimize its HDD motor production capacities and repurpose some capacity to other types of products.