mhoye, 
TIL: 'zerofree' finds the unallocated, blocks with non-zero value content in an ext2, ext3 or ext4 filesystem [...] and fills them with zeros.
mhoye, TIL: 'zerofree' finds the unallocated, blocks with non-zero value content in an ext2, ext3 or ext4 filesystem [...] and fills them with zeros.
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