Data HDD not recognized by Win7 after upgrade

I previously had an 80gb IDE and 200GB IDE drive and a 1TB Hitachi SATA drive running XP. I decided to upgrade to Win7 and at the same time replace the old IDE drives with a WD Black 750GB Sata 3. I put all my data on the Hitachi 1TB, installed Win7 on the WD, it seems fine, but My Computer won't recognize the Hitachi with all my backed up data. Device Mgr sees it, BIOS sees it, the WD HDD support software sees it, but I can't access it. I removed the drive via Device Manager, rebooted and again it was correctly identified by Windows and installed, but still not visible in My Computer. What am I missing? I did use a SATA 3 cable on the Hitachi (its a Sata 2), but I thought that was ok to do. Anything else I could have missed? Thanks for any help.
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More about data recognized win7 upgrade
  1. go to start--search and type in disk management then select the create and format partitions option and

    see if its listed and if its been initialised
  2. Make sure the drive isnt on a raid controller or try switching the controller mode to ide/sata/ahci.
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