DNS 321
I am having the same issue.
I need some help, please. First some background: Running Windows Vista 64 Bit, 8 GB Ram, with Windows Firewall, and Microsoft Security Essentials anti-virus. The DNS-321 (Hardware version = A2, Firmware version = 1.03 dated 08/17/2009, RAID = Volume_1: Standard, Volume_2: Standard) is connected to my D-Link DIR 655 wireless router and has been working beautifully for about a few years. A few weeks ago, it's been sporadically dropping off the network -- most noticeably of course when I'm transferring files to/from the device.
During a file transfer, I see this error:
"Cannot copy DSC_xxxxx: The specified network name is no longer available."
I immediately click on the mapped drive icon under My Computer, and I receive this (!) notice:
"An error occurred while reconnecting X: to \\dlink-E5D581\\Volume_1
Microsoft Windows Network: The local device name is already in use.
This connection has not been restored."
Cycling the powering off and back on every item on network clears the problem.
To try to fix the problem I first upgraded my version of Windows to Windows 7 Home Premium 64 Bit - no change. I then upgraded my version of Windows 7 to Ultimate - no change. I then changed my router to a Cisco Valet Plus - no change. I then changed all cables associated with the router and the DNS box- no change. I then reformatted my hard drives (2 of WDC WD10EADS-00MM2B0) in the DNS box - no change. I then reset the DNS box (reset button on back of the box) - no change. I then open the front cover of the DNS box a little bit to try to increase the air flow - no change.
I get the same results with Windows Backup, Acronis True Image Home 2011, GoodSync, and SyncToy 2.1 (x64).