Macbook pro won't recognise WD External hard drive

Have just purchased a macbook pro and it won't recognise my Western Digital external hard drive!!
It appears as 'Time Machine Backups' and doesn't show all my photos and music files. (deleting and reformatting WD hard drive not an option)
Can anyone help??
Many thanks

Sorry, meant deleting hard drive contents not an option, if required to do so to reformat.
Thanks

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