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HowTo: copy disk (image) using dd command with progressbar
Create image from disk /dev/sdb to image file /mnt/backup/disk_image.img. BS is for speedup.
# pv -tpreb /dev/sdb | dd of=/mnt/backup/disk_image.img bs=1M
Tranfer preview:
932GB 2:46:17 [95,6MB/s] [=============================================>] 100%