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"Need to format" new My Passport drive? - and partial backup failure

Hello, newbie member here.

I have just bought a new 1 TB Western Digital My Passport (said to be compatible with Windows 7 and upwards) and plugged it into my Windows 7 machine via the USB 3.0 port. Installed the necessary software from the WD Software Offline Installers folder.

At some stage during the process, the following window popped up:
“Microsoft Windows:
You need to format the disk in drive F: before you can use it.
Do you want to format it?”
plus option buttons to format or cancel.

This seems totally wrong to me: from what I’ve read, I should only need to format the drive if I wanted to use it on a Mac, which I don’t, and if I format it I’ll presumably lose the installation files already on the drive? Or is it actually standard to format the drive, but the user manual doesn’t bother to tell me? I don’t want to format it and then find out that I’ve fouled everything up.

I attempted the initial backup (including a number of video files of an hour or more, if that makes any difference), but a red warning triangle has appeared next to “Last backup”, but no further information. Eventually set things up so that the WD symbol appears in the taskbar, and I can access notifications that way. I get “Some files failed to backup” and “Target missing”, but when I click on View in the hope of getting more information all it does is return me to the “Current backup plan” window - no more information. I swear WD My Passports get more and more impenetrable every time I buy one. I’m totally confused!

Sometimes, Windows ask to format drive in order to resolve partition related issues. So you can format the drive to resolve partition related issues and can download preloaded files, that comes with new My Passport, from the WD Support web site.

WD Backup software doesn’t support system generated files and OS files and such notifications are shown under warning triangle symbol. You may refer below mentioned KBA for further details:

Support for Western Digital Hard Drives | Western Digital

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