Hi all,
had this issue today when trying to restore an old backup:
Error ED800012 (CRC Check invalid)
After I tried all sorts of things and researching on the web, where I didn't find any useful information, I found that the interface unit between the harddrive and USB connector was the reason. Finally, I mounted the harddrive in another USB drive box and it worked. Seems to be a timing or low-level USB issue...
BEE
Error ED800012 (CRC Check invalid)