My Hitachi external drive does not show up in my Dell Lapto Device Manager

I have a Dell external drive which is Hitachi Model 72323. I was happy with it until I used bit locker to add a password on it. After that it worked a couple of times then my computer will not recognize the drive again. It does not even show up in my device
manager. I plugged the device into many other computers and it is recognized promptly. However, another Dell that I have will only recognize it once in a while. I don't understand why it is not showing up in the device manager. Please help.

Hi,
I suggest you first install latest Windows Updates for your pc.
Reinstall USB controllers.
Click Start, then type device manager in the Search box, then click
Device Manager.
Expand Universal Serial Bus controllers. Right click a device and click
Uninstall. Repeat for each device.
Once complete, restart your computer. Your USB controllers will automatically install.
Update the BIOS, install your motherboard's latest chipset drivers. you need to view the manufacture website and the user manual
Meanwhile, please refer to the following article if you need some more information:
Error: “USB Device not recognized” when you try to access a USB external hard drive.
http://support.microsoft.com/kb/2654149
Yolanda Zhu
TechNet Community Support

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