1 list device 

cxh@minipc:~$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk 
sda1   8:1    0 465.8G  0 part /
sdb      8:16   1  59.5G  0 disk 
sdb1   8:17   1  59.5G  0 part /media/cxh/wheeltec

2 root mode

cxh@minipc:~$ sudo su
root@minipc:/home/cxh# 

3 sudo dd if=/dev/sdb | gzip>/home/wheeltec_nano20230616.img.gz

4 open new terminal
  sudo ps -aux |grep  dd

5 ok

root@minipc:/home/cxh# sudo dd if=/dev/sdb | gzip>/home/wheeltec_nano20230616.img.gz
.....63864569856 bytes (64 GB, 59 GiB) copied, 3765.57 s, 17.0 MB/s

root@minipc:/home/cxh#