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Disk data format
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<p>The <a href="/facts/Storage_Networking_Industry_Association/nWXbIQI2">SNIA</a> common <a href="/facts/RAID/IpzWWgog">RAID</a> disk data format (DDF) defines a standard data structure describing how data is formatted across disks in a RAID group. The DDF structure allows a basic level of <a href="/facts/Interoperability/7WgqUbXU">interoperability</a> between different suppliers of RAID technology. The common <a href="/facts/Redundant_array_of_independent_disks/IpzWWgog">RAID</a> DDF structure benefits storage users by enabling in-place data migration or recovery after controller failure using systems from different vendors. </p><p>DDF is an external metadata format that is compatible with the mdraid subsystem in the Linux kernel. The <a href="/facts/Mdadm/Nhv2GcUQ">mdadm</a> command-line utility is a part of the mdraid subsystem. </p>