[U.S. chip sector opens lower but strengthens, SanDisk and Seagate Technology rise over 2%] Odaily Planet Daily News: According to MSX.COM data, the U.S. chip sector strengthened after opening lower. As of now, Western Digital is up over 3%, Broadcom, SanDisk, and Seagate Technology are up over 2%, while Applied Materials and ARM are up over 1%.