Configuring Conky's Disk Sensor

Hi again. I use AutomatiK theme for my Conky sensors. Everything is done, except for the disks sensor. I am attaching a screenshot of my current F34 desktop, showing the sensor as well as my fstab file and the disks utility. I have being playing with the configuration file but so far I got partial success with my main disk (shows percents but the indicator bar remains empty), and none with the backup disk nor the read/wright sensor feature. Here is my current diskfile configuration:
double_buffer yes
update_interval 2
background yes

own_window yes

# own_window_type desktop
own_window_hints undecorated,below,sticky,skip_taskbar,skip_pager
#own_window_type override
own_window_argb_visual yes
own_window_argb_value 84
out_to_console no
own_window_transparent no
own_window_class conky-semi
use_xft yes
xftfont cure:size=10

#use_xft yes
#xftfont Sansation:size=9
xftfont Rounded Elegance:size=10
xftalpha 0
update_interval 2
cpu_avg_samples 2
net_avg_samples 2
double_buffer yes
maximum_width 320
draw_shades no
draw_outline no
draw_borders no
draw_graph_borders yes
stippled_borders 1
border_width 0
default_color white
default_shade_color white
default_outline_color white
alignment middle_right

use_spacer left
no_buffers yes
uppercase no

color0 white

color2 white
color3 1793d0


pad_percents 2
top_name_width 10
minimum_size 320 100


gap_x 15
gap_y -32

lua_load allcombined.lua

own_window_colour 000000
TEXT
${image img/hard_drive.png -p 0,0 -s 30x30}
${offset 35}${font Good Times:size=12}${color Tan1}disks ${color}${hr 2}${font}

 ${color}Main
${lua gradbar {6, 70, "${fs_used_perc /}" ,100, 75, 2, 10, 1, 0xFFFFFF, 0.25, 0x00FF00, 1, 0xFFFF00, 1, 0xFF0000, 1}}${alignr}${offset -5}${fs_used_perc /}% used
 /dev/sda = 499G (${fs_type /})${color}${alignr}${offset -5}${fs_free /} free
${color}${hr 1}

${image img/trans-bg240.png -p 4,65 -s 226x11} ${color}Backup
${lua gradbar {6, 145, "${fs_used_perc /deb/sdb}" ,100, 75, 2, 10, 1, 0xFFFFFF, 0.25, 0x00FF00, 1, 0xFFFF00, 1, 0xFF0000, 1}}${alignr}${offset -5}${fs_used_perc /deb/sdb}% used
 /dev/sdb = 1T (${fs_type /dev/sdb})${color}${alignr}${offset -5}${fs_free /dev/sdb} free
${color}${hr 1}

${image img/trans-bg240.png -p 4,140 -s 226x11}
## ${color}/media/Peppermint7
## ${lua gradbar {6, 220, "${fs_used_perc /media/Peppermint7}" ,100, 75, 2, 10, 1, 0xFFFFFF, 0.25, 0x00FF00, 1, 0xFFFF00, 1, 0xFF0000, 1}}${alignr}${offset -5}${fs_used_perc /media/Peppermint7}% utilisés
## /dev/sda4 = 31G (${fs_type /media/Peppermint7})${color}${alignr}${offset -5}${fs_free /media/Peppermint7} libres
## ${color}${hr 1}

${image img/trans-bg240.png -p 4,215 -s 226x11}
${color lightgrey}Lecture: $color${diskio_read}${alignr}${color lightgrey}Ecriture: ${color}${diskio_write}
${color #000000}${diskiograph_read 12,145 000000 EEEEEE}${alignr}${color #000000}${diskiograph_write 12,145 000000 EEEEEE}

Any suggestions as to how to fix this will be appreciated.