External HP hard drive on recognized

I have an HP pd500a hard drive that not being recognized by my new HP Envy 7M  laptop with win 8.1

Hi @LoganBD ,
Welcome to the HP Forums!
It is a terrific place to find answers.
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
I understand that when you connect your external hdd it is not recognized by your computer. It is a plug and play device not requiring drivers so it should be automatically detected and installed.
Here is a link to HP Drive User Manual.  Please note the backup software (SimpleSave) does not list Windows 8 so you may need to run the software in compatibility mode if you have an issue.
 Have you done all your Windows updates?
Have you tried running the  HP Support Assistant  to be sure you have all your HP updates?
Does the drive power on when connected?
Try disconnecting the USB cable wait for 30 seconds and reconnect?
Have you tried different USB ports on your notebook?
Have you tried a different USB cable?
Does the external hdd power on?
Do you see any messages or errors when you connect it?
When connected and powered on, is it seen in Device Manager?  Is there a mark on it or an error?
If you connect the external to another computer is it recognized?
Here is a link to Product Support HP SimpleSave - Hard Drives HP Portable - Hard Drives
for your convenience.
As the manual does refer you to  http://hpsupport.wdc.com for further assistance, here is their contact information.
WDC Contact Us.
You may need to use the serial number on the hard drive to pull up the correct device on the WDC site.
I hope this helps
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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