SanDisk, Western Digital and Seagate Technology shares surged after hours Wednesday after Micron's strong earnings.

SanDisk (SNDK) rebounds 3.13% premarket to $2,025. Key support holds at $1,820.90 after a 13.6% semiconductor selloff. Read more.

Micron shares surged nearly 8% after the company reported record fiscal third quarter revenue of $41.46 billion and issued strong guidance.