Hi katerine albarellos, first of all, what computer operating system are you using?
as S W mentioned, if it used for mac, you need to use disk utility to format it to either exfat or macos extended (journaled). If there is any current files in your external hdd, be sure to backup or make a copy , as re configuring the hdd partition, will result in data loss.
to be able to use for windows, what i had done is to use disk utility to spit into two partition, one is using macos extended (journaled) for time machine, misc and another exfat, which windows can write to it
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