Is the Seagate ST3200822AS an External Drive ( like USB connectivity ) or actual Hard Drive ? Even if it is Internal Hard Drive, You can make connect it to Win 7 and still keep it as Seperate Drive.
Connect the Hard Drive to Win 7 PC and Make it Slave ( partition ) by changing the Jumper on the Hard Drive ( jumper is a small pin or a lock that makes a Hard Drive Primary or Slave.
Once you connect the HD to Win 7, you will find new Drives Created in Win 7, this way you will differentiate between the Win 7 Drives and XP Drives
This link will how you the jumper position : Remove the jumper from slot 1 and put it in slot 2
http://www.google.com.sg/imglanding?q=changing%20jumper%20on%20Hard%20drive&imgurl=http://www.mysuperpc.com/build_your_own_computer/sata_hard_drive_connectors_jumpers_cr.jpg&imgrefurl=http://www.mysuperpc.com/build_your_own_computer/pc_install_sata_hard_drive.shtml&usg=__iTyJjkCN501Kstme6LZ42u0Q3ZU=&h=538&w=600&sz=95&hl=en&um=1&itbs=1&tbnid=2EXt5zyA0OXYxM:&tbnh=121&tbnw=135&prev=/images%3Fq%3Dchanging%2Bjumper%2Bon%2BHard%2Bdrive%26um%3D1%26hl%3Den%26sa%3DN%26tbs%3Disch:1&um=1&sa=N&tbs=isch:1&start=8#tbnid=t42Gq31Rw32OCM&start=13
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