Earlier quoted context omitted.
I doubt the 50% figure. Just as a test: I looked at the price history for a random 256GB SSD (from Crucial). The highest price in the last year? $115. The current price? $99. Not nearly a 50% drop. Link: http://camelcamelcamel.com/Crucial-MX100-2-5-Inch-Internal-C...
Now you are just cherry picking to prove a point. In a similar tone checkout the huge drop in prices for the Kingston Digital 240GB SSDNow[1]. It has dropped from about $400 to a mind blowing $78!! I have been tracking the prices of HDD's for a while now. Although I do agree that HDDs are currently substantially cheaper than SSDs, HDDs have had much less drop in price or increase in capacity compared to the pre flood…
It's not in the HDD manufacturers best interest to keep prices inflated, considering price is one of the 2 big competitive edge HDDs have over SSDs.
What happened during the floods was that WD[0] got lucky - data consumption remained high as ever, and SSDs simply weren't cheap enough at that point to fill the void that the floods left behind.
[0] And to a greater extent, Seagate. From what I remembered their facilities weren't directly affected by the flood, but their supply chains were disrupted.