There are not many visitors in this "Community Newsletter Q&A" forum, so you would do better to re-post in a more frequented forum. The list on the left will help you choose but you may want to consider "Computer Help", or "Computer Newbies".

Be sure to provide more information, eg;

1] What make and model computer?

2] Which OS?

3] Is this an external or internal hard drive?

4] If it is an external USB drive, what happens if you connect the drive after the PC has successfully booted up?