zerofree
Utility for ext2,ext3,ext4 filesystems that zeroes out unallocated blocks
zerofree is a utility for ext2,ext3 and ext4 filesystems that will scan the list of free blocks in a filesystem and fill with zeroes any blocks that do not already contain zeroes. This RPM also includes the sparsify utility, which will scan all files in a filesystem and ensure that they are maximally sparse.
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RedHat RHEL-7
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Unsupported distributions
The following distributions are not officially supported. Use these packages at your own risk.