My HDD (as secondary HDD) is not showing data after it is allocated in HP Z230 tower workstation

[HaroonZia]

Hi,

I know a little about basic troubleshooting of PC(s)/laptops. This particular scenario I faced for the first time.
I setup HP Z230 with an SSD hard drive as primary with windows Installed on it.
Then I connected my old HDD containing data. This secondary drive wasn't showing in This PC (as I'm using Windows 10 Pro). I went to the write click menu of This PC>Manage>Disk Management, there my secondary HDD was showing as UNALLOCATED, I allocated the drive & upon checking This PC, it was showing up there but now upon attempting to access it, the prompt to Format appeared. I stopped doing any further troubleshooting.

Now I assuming I've messed up by allocating my old HDD connected as secondary drive & instead of doing what I did, I should've had the expert guidance/support. This SSD drive is the first thing I am experiencing in this scenario.

Can someone plz guide me how can I access my data on the secondary HDD drive which is a Seagate 250GB hard drive for desktop PC.

Thank you.

[banhien]

@HaroonZia 

Does old HDD contain old Windows of your same machine ? If yes, it still has a "signature"on it therefore it is much better to move user files/data elsewhere then clean format it before use it for storage.

Regards.

[HaroonZia]

No, current machine is new & HDD has the windows in it though. Old desktop died couple of months back due to some motherboard problem.

[banhien]

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@HaroonZia wrote:

No, current machine is new & HDD has the windows in it though. Old desktop died couple of months back due to some motherboard problem.

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@HaroonZia 

Because it has Windows on it, please move it OUT the current machine and move/copy all your files/data then clean format it before put it back.

Hope this makes sense.

Regards.