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Hello and thanks for using JustAnswer.com , I am Serge and I will try my best to assist you.
When was the last time your external drive worked on any computer?
usually you don't need any specific driver, but sometimes you do. what is the exact model of the external HDD?
please allow me a couple of minutes to research on this specific model
by the way, does the drive have its own power or its powered only by usb?
ok, few moments please
go to : https://support.wdc.com/downloads.aspx?DL
Download and install WD Drive Utilities for Windows and WD Universal Firmware Updater for Windows
let me know if it works for you
What is the model of the computer that runs windows 7?
if you see your drive in "device manager", try manually installing drivers in the attachment
sure, you can reply in the morning and we can pick up from there.
hello, any updates?