1TB driver will not get fully connected to windows 7 sp1

My external hdd will not connect it self fully to windows 7 x64 sp1. All I hear is the sound that something is connected but no drivers are loaded. USB flash drives work fine but not usb external hdd.
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IanThConnect With a Mentor Commented:
has the drive got a partion attached

right click my computer click manage and then click on disk management and you may see it there without a drive letter so it will attach but explorer wont see it as windows doesn't know what it is until it has a drive letter
Lee W, MVPTechnology and Business Process AdvisorCommented:
Is the 1 TB drive seen when connecting to another computer?
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