Time Machine on a PC formatted external drive

My girlfriend plugged in an external drive with some data (Photos, mp3, docs etc...) from a Windows OS PC to a new iMac.
Time machine asked her to use it for backup. She answered yes thinking old data would never be cleaned. At the end of Time Machine first backup, old data were missed.
Do you think Time machine formatted the whole HD or simply now it is not able to see old data?
Plus now, when she plugs in the external HD back to a PC, the pc doesn't see the HD.
Fortunately everything on this HD were back up somewhere else but since apparently Time Machine didn't warn her that it would have formatted the HD this was not a good think.
Thanx for your answers.

Hi and welcome to Discussions,
since Time Machine cannot use a PC-formatted harddisk, it has completly erased everything that was on that harddisk by reformating it using the MacOS Extended(Journaled) file system.
Which also is the reason why Windows cannot see the HD.
But I concur with you that a proper warning from Time Machine would be good.

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