I running windows 7 Ultimated with a DNS323 on my network with the 1.08 firmware. I have 2 HHD, 1 1TB samsung spinpoint and 1.5TB WD green. The problem I'm having is when I tried to transfer a movie to the samsung drive I get the 0x80070021 error code. It does not do this when I transfer the same file onto the WD green drive. I am not running raid or anything like that, just 2 independent drive. The Samsung have 451GB of unused space and the WD has 632GB of unused space. Have any one have the same issue and find a solution. Tried looking up the error code on google, but it seem that its isolated to outlook.
Thanks
Scan the HHD with the disk check utility and reboot the DNS and now it seems to work. Strange!!