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<concept xml:lang="en" id="GUID-2F987147-1435-55F1-B61C-8413C4AD8424"><title>Direct file store structure</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The general structure of a direct file store, from the point of view of the physical file containing the store, is illustrated below.</p> <fig id="GUID-B9A986BB-322A-5432-BB12-92B1934954B6"><image href="GUID-D15068B5-D12E-5515-A772-EA3B304EE01E_d0e572624_href.png" placement="inline"/></fig> <p>The header is the content of the descriptor returned by the <codeph>Des()</codeph> member function of <codeph>TCheckedUid</codeph>; this contains the file store type and checksum; the length of the data is the size of a <codeph>TCheckedUid</codeph> object. Note that <codeph>TCheckedUid</codeph> is not part of the public API.</p> <p>The header is followed by the root stream ID. As the value of a stream ID is also the offset of that stream from the start of the host, this gives the offset of the root stream.</p> <p>The root stream ID is followed by all the streams; the root stream is the last stream.</p> </conbody></concept>