Hard Disks not detecting

I have three hard disks in my computers. Sometims One disk shows in my computer and suddenly it disapears. Un detected. I have reconnect the sata cables to get it back. Why does this happens. My hard disk is brand new and only 03 months old.
Reply to damithdg
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More about hard disks detecting
  1. can be bad drive..cable or bad power.
    Reply to smorizio
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