2nd hard disk not detected in my computer and device manager but visible in bios menu

i have one samsung ssd and 1 toshiba hdd, it was working fine up to yesterday but suddenly it disappeared. and when i tried to start computer it shows windows animation then just black screen. i have tried restarting after disconnection 2nd hdd it worked fine. but when i connect 2nd hard disk pc wont start up still it shows in bios menu.
my pc config as below
Intel 3.2 GHz LGA1150 4570 i5 4th Gen
Samsung 840 Series 120 GB SSD
Corsair Vengeance DDR3 8GB
Intel DB85FL 4th Generation Motherboard
Toshiba 500GB Desktop Internal Hard disk (2nd one)
Cooler Master HAF 912 Combat Mid Tower
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More about 2nd hard disk detected computer device manager visible bios menu
  1. just to clarify the windows OS is installed on the samsung 840 SSD,

    now your unable to boot windows,

    but the bios detects the SSD.

    correct me if i'm wrong..
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