Hello,
Filesharing requires 4 basic things: Network connectivity, Firewall permissions, NTFS Permissions, and Sharing Permissions. I think your Network and firewall is working properly, so let's look at NTFS and File Sharing.
1) Did you format the new drive? Is it FAT32 or NTFS? If NTFS, did you allow the local users group access to the drive? To test, go to the computer that has the drive attached to it, login as the user, and see if you can create a folder there. If so, permissions are fine. If it is a FAT32 drive, do not worry about this part at all.
2) Did you setup sharing permissions properly? You should right-click on My Computer, and go into Manage. Go into the Shared Folders... and find your share. Check the share permissions to make sure the group/users is enabled properly.
Let us know what you find.
Christian
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