If you want to store your chunks on your
D: drive, you can set the
chunk_store_root variable in
safe_vault.vault.config, perhaps something like:
The vault will create another directory
safe_vault_chunk_store inside the one you specify, so in this case,
D:\maidsafe\safe_vault_chunk_store. You'll have to restart your vault in order for the config change to take effect.
I'm not super sure about the slash format (I don't have anything running Windows to test on), but if you can't get it work, just ping us and we'll advise. Cheers!