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Fill with zero's

Command	Explanation	Remark
dd
cat /dev/zero > /mnt/fs/zeros; sync; rm /mnt/fs/zeros		Do not use this. Can slow down fsck
sfill		Do not use this. Can slow down fsck. Not in the Debian repository
shred --iterations=1 --verbose --zero file.txt		Works on files not on disk nor partitions
zerofree	Scans the free blocks in an ext[2-4] filesystem and fills any non-zero blocks with zeroes	Works on ext[2-4]. Output is like: 1586/2910/4096 being (our guess) Zeroed bytes/Free partition space in bytes/Partition or disk size in bytes

Useful links

Background information on zerofree

Other values

Fill with 0xFF or any other byte value can be done with

377 is octal for 0xFF
“x” is the drive number

tr '\0' '\377' < /dev/zero > /dev/sdx
zerofree -f value

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