(BRCD) Brocade, which makes switches for storage networks, was down 18.4% in late morning after data storage hardware giant EMC (EMC) slammed the sector with a warning late Thursday.

Also being hurt are

Emulex

(EMLX)

, down 17.8%, and

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McData

(MCDT)

down 13.7%.

Credit Suisse First Boston

cut Brocade, Emulex and McData to hold from buy. EMC was down 25.5% in late morning after hitting a 52-week low of $22.30.