Anything I can do to help, let me know. This has turned into a big mess.
I was able to initialize/format one of the HDs. The second HD is listed in disk management showing that it needs initialized. When I try to initialize I receive an error telling me the device is not ready. I have tried on two different computers (Windows 7 and 10) and tried to initialize using both MBR and GPT and receive the same error every time. I guess this HD goes in the trash.
The computer that damaged the drives in my home computer and is a couple years old. Both HDs are 2TB and the same make and model number. Originally, the HDs were in a Windows 7 computer that had two other HDs. I was trying to backup another 2TB HD (same make/model) to these 2 HDs. All were connected using internal SATA connections. After copying the files to both HDs I shut down the computer and removed the 2 HDs. They sat for a couple months unused. I decided to do another backup of the computer so I reconnected the HDs using the same internal SATA connections. When I turned the computer on, neither of the HDs were coming up so I went into Disk Management and saw that both HDs were listed, but both said they needed to be initialized.
At this time, I decided to try the HDs in a new computer running Windows 10. I connected the HDs using internal SATA and got the same result: found, but needed initialized. I disconnected the HDs again and they sat for another couple of months before I tried to get them working again, which is when I posted on GTG.
As I mentioned in a previous post, I have since purchased a docking station (2-port) and 2 additional HDs to do backups. Using the new HDs and the docking station I have not had any problems. The docking station is connected to the offending computer.
Let me know if there is anything else I can post that may be of use to you or anyone that happens to stumble across this thread.
Thanks again for your time and assistance. Take care.