Bliss! -A simple power cycle while bridge was still connected with USB, woke the disk up! Both disklabel and fdisk worked fine on the disk after this and I've got my files. Before the powercycle I got same Input/output error from fdisk as from disklabel:
# fdisk sd1 fdisk: DIOCGPDINFO: Input/output error fdisk: Can't get disk geometry, please use [-chs] to specify.
