Can't see my files on old WD1200B Drive

WD External Drives External Drives for PC
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These are good places to start. There’s more advanced programs such as Ontrack EasyRecovery and GetDataBack from Runtime. Also Recover My Files is another option. These are all payware.

And these, as well as testdisk and Recuva could work, assuming the Xbox has not overwritten the original data.