Synology doesn’t see drive any more. Tried that.

Thanks for advice, this exceeds my “expertise” level.

Fair question, I had large amount of files, photos and videos to move and since NAS has 2 x USB ports I thought why not? Over the network it’s quite slow. The thing worked fine, I left it connected for 2 days and then came up with stupid idea to unplug it and do something with it on my iMac.

Mac OS Extended Journaled, could easily read it on PC.