A quick quesiton about Time Machine

I have external hard disk which I used to keep other files like music , video.
If I use the same external HDD as a backup storage - will the TIME MACHINE format the external drive before it starts backing up files.
Thanks

Time Machine doesn't automatically format a hard drive. You will just have problems using the drive unless it is formatted in HFS+ journaled. It will not be able to use the drive if the partition is a pc format like FAT32 (which is how most external drives ship).
If you are not sure of the drive's condition you can use Disc Utility to see how it is set up.

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