How do i know if my hard drive is bad?

i have a emachines running windows vista home. Every time i turn it on i get a black screen saying boot to fail channel 2 S.M.A.R.T capability disabled boot from cd and occasional i get the blue screen of death could this be the hard drive of something else after i get these screen i can't do nothing not a... show more i have a emachines running windows vista home. Every time i turn it on i get a black screen saying boot to fail channel 2 S.M.A.R.T capability disabled boot from cd and occasional i get the blue screen of death could this be the hard drive of something else after i get these screen i can't do nothing not a single thing i already tried hitting the f10 key and nothing. So anyone out there with experience could you lend me a hand
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