Kashub's Code Barn - "Secure disk wipe out using dd with progress"

# /dev/urandom fills disk (or partition) with random characters, so safely wipes out all data
# make sure you use the right device instead of /dev/sdb1
# status=progress shows additionally how many bytes have been copied already, so you can calculate rough ETA
dd if=/dev/urandom of=/dev/sdb1 bs=1M status=progress
 

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