can't see external usb drive in Computer

Hi, I have an external USB hard disk plugs to a server which runs 2008R2.

I can see the drive in the Disk Management, but can't see it in Computer. I was able to see it after plugging in for a while. However, it disappeared later on, but still listed in Disk Management.  Any idea? Thanks
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Naranthiran DSystem AdministratorCommented:
Check whether the drive letter is assigned to the external USB hard.

If not assigned a letter to the USB drive and check the my computer for listing..
and be sure the disk has its own power supply; if not, that can cause the disappearing
if it has no power - use a POWERED usb hub, like this :  (top 10 listed) :
EirmanChief Operations ManagerCommented:
Consider removing the hd from the caddy and inserting it directly into your PC in a spare sata location.
If it works, then your hd caddy is at fault.

Try this great little free utility

I use it on XP & Win7 (have not tested it on Win8) with this type of device ...
I have a stack of bare drives that I can insert and remove very quickly .... great for archiving!
A useful trick with defective USB devices is to reboot, go into "Device Manager" and remove any defective USB listings (yellow triangle) and plug in your USB device again.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Checkout the link below.I hope you will get the solution:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Legacy OS

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.