Mein Problem hat sich gelöst:
#[global]
workgroup = smb
security = share
share modes = yes
[homes]
comment = Home Directories
browsable = yes
read only = yes
create mode = 0750
[public]
path = /mnt/usbhdd
public = yes
writable = yes
comment = smb share
printable = no
guest ok = yes
als smb.conf speichern dann gehts.
#[global]
workgroup = smb
security = share
share modes = yes
[homes]
comment = Home Directories
browsable = yes
read only = yes
create mode = 0750
[public]
path = /mnt/usbhdd
public = yes
writable = yes
comment = smb share
printable = no
guest ok = yes
als smb.conf speichern dann gehts.