Those are specialized NAS chassis. We have a number of them, 4U size, too heavy to move when the drives are in. edit: They look like this: https://knowledgebas

Those are specialized NAS chassis. We have a number of them, 4U size, too heavy to move when the drives are in. edit: They look like this: https://knowledgebase.45drives.com/wp-content/uploads/2019/04/20190405_163715-1024x768.jpg https://knowledgebase.45drives.com/wp-content/uploads/2019/0... (image from ddg)