Thanks for looking into this.
If I am not able to see my external hard drive on the computer, do you think I'll notice it after loading it on Ubuntu?
I believe that the problem is with the drive and not the system.
The reason is that I tried the external hard drive (Seagate) on various systems and it gives the same issue everywhere - visible on the list of devices but not visible as a drive letter on my computer.
Do you still think I should try Ubuntu?