HP Media Vault MV2020 & OS X 10.5.5

When I spoke to one of my techie friends they walked me through the steps.

When you are in the config pasges of the network drive under the user settings tab. If you have workgroup selected there shouldn't be an issue unless you have the port blocked in network security. (File Sharing & Printer Sharing should be allowed) If you have a section with "defined users" you need to note exactly the user name you listed and whatever the password is and put in in the network settings in Leopard. From the network select advanced and select 802.x click on the plus in the left and add a system profile. It will ask for the user name and password and these should be what you are using to log in to the HP Media Vault. Now you should be able to connect with cifs. When you try to connect, it will again ask for the media vault user id & password. (I don't know why I couldn't just put the info here, but it didn't work until the info was put in the network settings as well) Hope this helps.

for file operations, open finder - Go - Connect to server. enter server address (i.e. cifs://192.168.1.101) and the available volumes should show.
If you want this to be done automatically, add to system preferences, accounts, login items