Hard disk doesnt work

[gchandeepa3]

Ive inserted 2 hdd drives but only the hard sith os is shown but other 1 dont shows but it worked properly before what should i do to make it right

 

[USAFRet]

MERGED QUESTION
Question from gchandeepa3 : "Hard disk doesnt work"

I ve connected 2 hatd drives .the hard with os work but other 1 dont shown