Format of the root (first) directory record in release 6.22.06. It is never compressed.

This directory record differs from subdirectories (see Format of a TDirectory record) in the additional Name and Title at the beginning of the DATA (after the TKey).

If the SeekKeys or SeekPdir in the TKey are located past the 32 bit file limit (> 2000000000), then these fields will be 8 instead of 4 bytes and 1000 is added to the TKey Version.

If the SeekDir, SeekParent, or SeekKeys in the TDirectory header are past the 32 bit file limit, then these fields will be 8 instead of 4 bytes and 1000 is added to the TDirectory Version.

-------—TKey------------—

Byte Range	Member Name	Description
0...3	Nbytes	Number of bytes compressed record (TKey+data)	TKey::fNbytes
4...5	Version	TKey class version identifier	TKey::fVersion
6...9	ObjLen	Number of bytes of uncompressed data	TKey::fObjLen
10...13	Datime	Date and time when record was written to file	TKey::fDatime (year-1995)<<26\|month<<22\|day<<17\|hour<<12\|minute<<6\|second
14...15	KeyLen	Number of bytes in key structure (TKey)	TKey::fKeyLen
16...17	Cycle	Cycle of key	TKey::fCycle
18...21 [18...25]	SeekKey	Byte offset of record itself (consistency check) (64)	TKey::fSeekKey
22...25 [26...33]	SeekPdir	Byte offset of parent directory record (0)	TKey::fSeekPdir
26...26 [34...34]	lname	Number of bytes in the class name (5)	TKey::fClassName
27..... [35...]	ClassName	Object Class Name ("TFile")	TKey::fClassName
0...0	lname	Number of bytes in the object name	TNamed::fName
1...	Name	lName bytes with the name of the object `<file-name>`	TNamed::fName
0...0	lTitle	Number of bytes in the object title	TNamed::fTitle
1...	Title	lTitle bytes with the title of the object `<file-title>`	TNamed::fTitle

-----—DATA--------------—

Byte Range	Member Name	Description
0...0	lname	Number of bytes in the TFile name	TNamed::fName
1...	Name	lName bytes with the name of the TFile `<file-name>`	TNamed::fName
0...0	lTitle	Number of bytes in the TFile title	TNamed::fTitle
1...	Title	lTitle bytes with the title of the TFile `<file-title>`	TNamed::fTitle
0...1	Version	TDirectory class version identifier	TDirectory::Class_Version()
2...5	DatimeC	Date and time when directory was created	TDirectory::fDatimeC (year-1995)<<26\|month<<22\|day<<17\|hour<<12\|minute<<6\|second
6...9	DatimeM	Date and time when directory was last modified	TDirectory::fDatimeM (year-1995)<<26\|month<<22\|day<<17\|hour<<12\|minute<<6\|second
10...13	NbytesKeys	Number of bytes in the associated KeysList record	TDirectory::fNbyteskeys
14...17	NbytesName	Number of bytes in TKey+TNamed at creation	TDirectory::fNbytesName
18...21 [18...25]	SeekDir	Byte offset of directory record in file (64)	TDirectory::fSeekDir
22...25 [26...33]	SeekParent	Byte offset of parent directory record in file (0)	TDirectory::fSeekParent
26...29 [34...41]	SeekKeys	Byte offset of associated KeysList record in file	TDirectory::fSeekKeys