Western Digital just bought a bunch of memory cards. The storage giant just announced that it has agreed to buy SanDisk Corp for about $19 billion. This comes after speculation that SanDisk was shopping for a buyer.

The deal values SanDisk at $86.50 a share, which is a 15% premium on the previous day's closing price, giving the company a value of $15.4 billion. SanDisk is currently up 4.78% in pre-market trading.

This deal brings together two of the largest storage companies.

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