Hitachi hard disk not detected please help

i recently bought a HITACHI 500GB external hard disk. It is not detected in my laptop, but is detected in other laptops. Other hard disks (except hitachi) are detected in my laptop. I use windows 7. I reinstall the O/S, but the problem still exits.So how can my hitachi hard disk be detected in my laptop?
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More about hitachi hard disk detected help
  1. Check if this drive is visible in Disk Management (My computer > Right Click > Manage > Storgae - Disk Management. If its visible you may need to Initialize the disk.
  2. Could it be that your laptop doesn't support SATA-2? If so, is there a jumper setting on your HDD that limits the interface speed to SATA-1?
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