dd

opt	default	iflag	val	for
bs=BYTES	512			ibs,obs
status			process
seek=N
skip=N

• https://man7.org/linux/man-pages/man1/dd.1.html

dd if=/dev/sda of=/dev/sdb bs=128k status=progress iflag=count_bytes count=600M

# skip 到分区
#dd if=/dev/sda of=/dev/sdb bs=128k status=progress iflag=count_bytes,skip_bytes,seek_bytes seek=9439232 skip=9439232 count=2G
# 直接使用分区 IO
dd if=/dev/sda3 of=/dev/sdb3 bs=128k status=progress