In Windows 8.1 pro, i use external HDD Model : ST1000LM024 and don't detected .
i see light is blinking when i connect with usb cable.
How to detect it?

Hello,

Have you tried this connected to another computer? This should narrow the issue down to the HDD or PC.

Also, ARe you sure the HD isn't detected or are you just not seeing a partition/drive letter?

What does the Disk manager tell you?

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