I have a 2.5" 1Tb disk in a caddy that connects through a switchable USB hub and USB extension lead to the PC. So there are two leads - one between the hub-and-PC and one between the caddy-and-hub. When I switch on the power to the hub, and the connection on the hub, often the disk 'rattles', and either does not appear in THIS PC or takes a very long time to show. Over time the situation has deteriorated from no trouble what-so-ever, to the current disablement. Logically the fault can be in many places : at the USB socket on the PC, in the lead from the PC to the hub, in the hub, in the specific port of the hub, in the switch to the hub's port, in the lead from the hub to the caddy, in the caddy, or in the HDD. There was a time that jiggling the lead from the caddy to the hub would fix the problem. That is no longer the case. Now I can only get the normal expected response, if I connect the HDD by a SATA lead direct to the motherboard's SATA socket, and even then not reliably. It works perfectly well from its caddy in another PC running a 64bit version of the Win10ProV20H2 (faiulure occurs in the 32bit O/S).The fact that it CAN work as expected suggests to me that the caddy, the HDD innards and its contacts are OK. I have tried many error-elimination tests : other HDDs connected through the hub work OK, replacing both leads, using other hub sockets etc; I am looking for suggestions I may have overlooked.