external HDD appears offline and unallocated space. [solution]

[Microsoft Windows]

I am opening this topic because there are hundreds of topics opened on Microsoft with the same title and many Microsoft representatives cannot answer users correctly. In most of the tickets, she suggested assigning a new drive letter, formatting it, or many other unnecessary solutions.But this issue that I have opened now will be a definitive solution for those who have the same problem in the future.I connected the external HDD of my approximately 10-year-old laptop to my desktop computer with a USB cable. The HDD booted without any problems. I installed all my programs on the computer to the

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