![]() Zerofree has been written to be run from GNU/Linux systems installedĪs guest OSes inside a virtual machine. it (temporarily) uses all free space on the disk, so other concurrent write actions may fail.it makes the disk image (temporarily) grow to its maximal extent.This has many disadvantages, which zerofree alleviates: The usual way to achieve the same result (zeroing the unused blocks) is to run "dd" do create a file full of zeroes that takes up the entire free space on the drive, and then delete this file. ![]() Zerofree requires the file-system to be unmounted or mounted read-only. In this case, depending on the type of disk image, a secondary utility may be able to reduce the size of the disk image after zerofree has been run. This is useful if the device on which this file-system resides is a disk image. Zerofree finds the unallocated, non-zeroed blocks in an ext2 or ext3 file-system and fills them with zeroes.
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