Had nothing to do with MU's earnings report. This sell off is options related. In other words this was an effort of call and put option sellers to make as many call and put options worthless. This is how big money manipulates and inflicts the greatest pain / loss on option buyers. After next Friday ( options expiration) MU will move back up.
The problem with AAPL is that they do not have any more tricks in their bag of goodies. Phones are becoming a commodity and at some point will all offer the same features. APPL has plenty of cash and needs to acquire other companies with different products that produce new sources of income.