Editing Disk image (section)

=== Speed and failure ===
Disk imaging can be slow, especially for older storage devices. A typical 4.7 GB DVD can take an average of 18 minutes to duplicate.<ref name=":4" /> Floppy disks read and write much slower than hard disks. Therefore, despite their small size, it can take several minutes to copy a single disk. In some cases, disk imaging can fail due to bad sectors or physical wear and tear on the source device.<ref name=":10" /> Unix utilities (such as [[Dd (Unix)|dd]]) are not designed to cope with failures, causing the disk image creation process to fail.<ref name=":6" /> When [[data recovery]] is the end goal, it is instead recommended to use more specialised tools (such as [[ddrescue]]).