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3. Hard disk writing format
The whole hard disk space can be separated to 3 parts, System Area, Entry Information and Video Data, as the
following.
Hard disk space overview
System Area (LBA: 0x0)
Entry Information (LBA: 0x9)
Entry Information is composed of ENTRY _MAT and ENTRY_LIST
ENTRY_MAT (Entry Management Table)
Start from LBA 0x9
Field Offset(Byte) Length(Byte) Description
ID 0 16 Fixed,
EntryTable_SA 16 4 Fixed, 0x9
AlarmTable_SA 20 4 Fixed, 0x89
VOBS_SA 24 4 Fixed, 0x109
LastEntryNum 28 4 Not used now
LastAlarmNum 32 4 Not used now
LastRecSectNum 36 4 Not used now
Field Offset(Byte) Length(Byte) Description
FirstRound 0 1 Not used now
FirstRoundV 1 1 1: All Video Data area was
recorded
at least once.
Reserved0 2 2
CurrWrtElem 4 4 Index point to the current used
entry in Entry List.
FirstElem 8 4 Index point to the first entry in
Entry List.
Reserved1 12 4
System
A
rea
0x0
Entry Information Video Data
0x9 0x109
2-4