I use the dock with 3.5-inch drives, connected to an iMac and it works perfectly. The device appears to me to be of very good quality, unlike other models tested in the past (more expensive and fragile). This one, however, already share its weight, its shape and its robust construction that seems strong, seems to be a product of very good quality. For now, it gives me complete satisaction and I've had no trouble using all of my sauvergades on 3.5 inches.