Karl storz endoscope wont recognize Hdd

Not sure if this is the best place to post it but hope it is.

I work in laparoscopic surgery and I,ve tried many times to use a external disc to record my procedures but it wont recognize it (is as if i havent plugged anything in)

The device is a Karl Storz Image S1

Ive used a WD elements and a maxone slim series hdd.

If its any use I,ve seen a doctor use a lenovo usb to record but its just too small capcity for me

Thanks for any help