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And how to drop (to nullify) all network settings in MC? Business seems to me in it, MC remembered absence of HDD and doesn't see its appearance

It the extenal hd is not exposed as a normal network drive ? ( \\Sever\Share  path ? )

Path  - \\KEENETIC\FreeAgent GoFlex Drive

KEENETIC - router
FreeAgent GoFlex Drive - Share

MC in Network sees KEENETIC, and drive is not.

Sorry. My English=0 

HDD is connected to a router, win7 sees it and through a home network, through a router, it is possible to be connected.
Multi Commander sees a router, and HDD doesn't see any more

Here is my vision.

External HDD is connected to Zyxel keenetic router. Windows Explorer is able to "see" that drive while MC is not.

Yes

The computer is connected to ZyXEL Keenetic Giga. K Zexel is connected external HDD. If are connected through Windows, through "Windows Explorer", that is the network Keenetic resource, and the network drive is farther. And if to be connected through MultiCommander, through Network, "Keenetic" is visible, and here external HDD - no