Seagate (STX +3.1%) and Western Digital (WDC +4.1%) pop after receiving upgrades to Buy from Craig-Hallum. The firm cites hard drive inventory reductions and lower expectations, and a lack of pricing changes. Judging by their current valuations, investor expectations for STX and WDC are definitely quite low. JPMorgan downgraded Seagate last week, while Barron's named both companies to its list of top 10 picks for 2013. Hard drive controller supplier Marvell (MRVL +1.9%) is also up.