Any thoughts on what causes this at startup? It is only occasionally, not a daily thing. Drive F is a backup drive. Thanks.

Looks like a check disk (chkdsk) scan. Your F drive may have some corruption.

You have hard drive issues, integrity. You're lucky you're getting a warning shot, make sure you are backed up like yesterday…

Being that it is "F" drive and not "C" drive. It looks like it's not your boot drive but an attached drive…

I looked at everything on the drive, and it shows to be healthy. I can't find a thing wrong with it. Didn't know if it might be a signal of something that I didn't understand.

BMo said:

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I looked at everything on the drive, and it shows to be healthy. I can't find a thing wrong with it. Didn't know if it might be a signal of something that I didn't understand.

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Continue to use at your own risk. Windows doesn't do that for no reason. If it only happened once - it could be corruption via a bad reboot, or if it's a usb-connected drive - drama with it's connection and read-write state....

... the fact that it's happened multiple times, says a lot.

... but you need to make darn sure it's backed up... it's a warning shot.

It is a backup drive with nothing being backed up anymore. I'll probably take it out and lay it aside.