External USB disk storage for Zoneminder

Its often useful to have an external storage for ZM videos , stills and events

Create usb disk , partition & format with label ZMDATA

create a directory  /var/lib/zmdata

edit /etc/fstab and add entry :

LABEL=ZMDATA    /var/lib/zmdata    ext4    defaults    0    0

mount  the disk and create directories :

/var/lib/zmdata/zoneminder/{events,images}

edit  / create a new file  /etc/zm/conf.d/03-usbmount.conf with contents

ZM_DIR_EVENTS=/var/lib/zmdata/zoneminder/events
ZM_DIR_IMAGES=/var/lib/zmdata/zoneminder/images

set permissions,  chown -R 33.33  /var/lib/zmdata/zoneminder/

add the new storage and delete default, restart zoneminder