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This is a nonsense to use bs=1m or 2m. This is a block size of the media. The ISOs are usually using 512 bytes. It will work with different sizes but may cause some warnings. dd is a raw read and write to the device, there is no known size the progress may display.

To see a kind of progress use additional utility "pv" - example:

dd if=/dev/zero bs=512 count=2000000 | pv | dd of=/dev/null bs=512

After dd I would use


before removing usb drive.