1. July 24, 1998 Matsushita Electric Industrial Co., Ltd. Technical Proposal for DVD-R File System Specifications WG3-7/24/98-7

2. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 Concept DVD-R File System should support a general file management functions for Incremental File Recording on the following conditions - Based on UDF Specifications (Revision 2.0) - Without using any special device commands

3. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 Outline of Current Specifications (Version1.0) The start address of Unrecorded Area is recorded in Lead-in Area & Border-in Area Lead-in Area Volume/File Structure & Files Border-out Area Border-in Area File Structure & Files Border-out Area Unrecorded Area In order to Read/Write these address information from/to Lead-in Area & Border-in Area DVD-R Specific device commands have to be required!

4. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 New Solution for This Issue ICB(Strategy Type 4096) of Root Directory is useful to handle the start address of Unrecorded Area to search the latest Root Directory ICB (Strategy Type 4096) of Root Directory can be written/read by using the conventional device command(WRITE/READ)

5. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 Disc Format Operation Write operation On Format The first generation of ICB (Root Directory) has the start address of Unrecorded Area

6. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 How to Write a file File-a Dir-A Root 1. Find Unrecorded Area. ( + + ) 2. Write files and related file structure.( ) 3. Write Over-run Extent.( ) 4. Write updated ICB.( ) On write File-a of Dir-A

7. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 How to Read File 1. Find Unrecorded Area. ( ~ ) 2. Find the latest ICB for Root Directory.( ) 3. Search and read out File-a. ( ~ ) File-a File-b Dir-A Dir-B Root On read File-aof Dir-A

8. Copyright Matsushita Electric Industrial Co., Ltd July 24, 1998 Summary ICB(Strategy Type 4096) of Root Directory is useful to handle the start address of Unrecorded Area to search the latest Root Directory ICB(Strategy Type 4096) is supported by DVD-ROM & DVD-RAM File System Specifications New Solution for DVD-R is consistent with DVD-ROM & DVD-RAM File System Specifications