Using Time Machine with a Used External Hard drive

I had posted a question before about using an external hard drive that I have for a Time Machine back up that already have some stuff on the hard drive, and if using it for Time Machine would erase the info I currently have on the drive.
I got a response that said if it was formatted as Xsan or Mac OS Extended with or without case-sensitivity or journaling, it would not erase my current info, but otherwise, it would.
When I checked the format on my external hard drive, it is listed as "MS-DOS (FAT32)". Does that mean it is the Xsan/Mac OS extended (that wouldn't erase my current information) or does it mean it WILL erase my info?
Thank you!!

Does that mean it is the Xsan/Mac OS extended (that wouldn't erase my current information)
No
does it mean it WILL erase my info?
Yes. FAT formatted drives are for use with Windows.

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