[#node-UNDO_DATA_DISK_OVERHEAD]
= xref:node.adoc[node]::UNDO&lowbar;DATA&lowbar;DISK&lowbar;OVERHEAD
:relfileprefix: ../
:mrdocs:

Total overhead when writing undo data&colon; header (8 bytes) plus checksum (32 bytes)

== Synopsis

Declared in `&lt;node&sol;blockstorage&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
inline constexpr uint32&lowbar;t UNDO&lowbar;DATA&lowbar;DISK&lowbar;OVERHEAD = &lcub;STORAGE&lowbar;HEADER&lowbar;BYTES &plus; uint256&colon;&colon;size()&rcub;;
----


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