I'm trying to figure out the best way to connect 4 or 5 3.5 inch SATA internal hard drives to a RasPi, haven't decided which one yet. Also, I don't want to connect a purchased 4 or 5 bay hard drive dock, they are way too expensive. There was a SATA hat made by Radxa that had 4 ports, so that would have worked perfectly but I don't think they are for sale anywhere anymore. Also, i bought a SATA port multiplier I can use, but apparently, it won't work with most USB to SATA adapters. Some ideas I thought of are a mini PCIe port hat and then a SATA adapter with multiple ports into that, or maybe there is a compute module board somewhere with a few SATA ports. Any ideas? Man, I really wish I could still buy that Radxa sata hat, it would have been perfect.