Gallstone ileus occurs when gallbladder stones erode and become lodged in the small bowel. thereby causing obstruction. These stones usually impact the terminal ileum because of its narrow lumen; however. they can also be found in less common locations. https://www.roneverhart.com/HGST-Ultrastar-7K6000-HUS726040ALS214-4TB-7-2K-RPM-SAS-12Gb-s-512n-128MB-3-5-SE-Hard-Drive/