[ROG Rapture GT-AC5300] Issue mounting USB HDD (cannot see data via Samba) after unmount via GUI

Previously connected a USB3 WD My Passport 3TB HDD (exFAT4 formatted) to the GT-AC5300 Wanted to have a networked HDD on the router. Installed Download Master to the HDD and downloaded a lot of Torrents. Shared it in Samba over the network to Window 7 64Bit OS computers. Copied a lot of data to the HDD from the network.

[Noticed some Issues here]
[ A ] The data transfer to the HDD over the network was limited to only 12 megabytes per second].

[ B ] The...

[ROG Rapture GT-AC5300] Issue mounting USB HDD (cannot see data via Samba) after unmount via GUI