Well, good job there is some other help out there.
I found that each drive has a .smb.ses folder which seems related to the auto/reconfiguration of the SMB file.
Each one of these files seems to build the complete and eventual smb.conf so it's a simple case of modifying these to get what you need.
eg,
/mnt/HD_X4/.systemfile/.smb.ses <- Replace X with your drive (a, b, c, d).
#version = 1.06
[ Volume_2 ]
comment =
path = /mnt/HD_d2
valid users =
read only = no
guest ok = yes
oplocks = no
map archive = no
For my HD_d4 this label is obviously incorrect so I can manually edit this and correct the issue.