Sony DVD Rom/DVD Video User Manual download pdf (Page 19)

3. DVD Rom

3. DVD-Rom

3.1 Data Preparation

The first step in formatting is the collection and prepa-

ration of the input materials. You can submit already

formatted data as an image on tape or leave the for-

matting of your data to us. Unformatted data on sto-

rage media, as well as backup formats on tape or

unformatted data transmitted via ISDN, first have to be

converted into a DVD-ROM compatible format. Please

note that these additional process steps take more time

and are more expensive. In order to arrange the data in

a required sequence, please provide a detailed listing of

the file and directory structure of the final DVD-ROM.

If you submit a tape, please inform us whether there is

a DVD image or a backup format on this tape.

According to chapter 3.3. (image on tape) we are able

to achieve shorter turnaround times for your orders and

limit premastering costs as long as there is an already

formatted DVD image on tape.

When sending hard disks or exchange discs please let

us know the number of files and the data quantity. Pack

your data carrier carefully to avoid damage during

transportation. Moreover, we ask you to mark your

input carriers. Please be sure to use adequate fibre

pens which do not damage the surface of the disc, par-

ticularly with DVD-R.

3.2 Formatting

Sony DADC formats data according to the UDF-Bridge

(UDF + ISO 9660) standard:

UDF-Bridge Format:

Is a new logical format for volume and file structure on

DVD-ROM discs to support the interchange of informa-

tion between a computer system and dedicated DVD

drives or players.

UDF-Bridge also stands for a combination between the

Universal Disc Format (ISO/IEC 13346) and the ISO

9660 standard.

Through the naming and file structure of UDF, the UDF

file system is much more powerful than the file structure

of ISO 9660.

However, the UDF-Bridge combines both the UDF and

ISO 9660 formats. Therefore the file structure has to

meet the ISO-9660 designation agreement.

ISO 9660:

The ISO 9660 (level 1) file structure is limited to the cha-

racters ”A-Z”, ”0-9” and ”

–

” (underscore) with a

maximum of 8 characters in length and 3 characters

extension and a maximum of 8 directory levels (inclu-

ding the root directory).

To avoid the restrictions of ISO 9660 level 1 and to use

longer file names, level 2/3 can also be used. These

levels restrict filenames to 30 characters and directory

names to 31 characters.

Joliet extension:

To meet the demand for Windows 95 file names, there

was an extension designed called Joliet format. This file

system allows longer file and directory names than ISO

9660 level 1 as well as level 2/3, where file or directory

Identifiers may be up to 64 characters.

Apple Macintosh formatting

Apple Mac data are acceppted for DVD-ROM format-

ting. However, all data should be provided on a Mac

formatted media.

3.3 Input Media

DVD-ROM images on tape

Sony DADC will accept ANSI labelled DVD-ROM

images either on DLT or SDX tape. We strongly

recommend that any tape compression is turned off.

The DVD Data Sector size can be 2048, 2054 or 2064

Bytes/Sector.

The DDP (level 2.00) is either to be placed at the front

of the tape followed by the DVD Leading-data and the

DVD Image or on a separate Floppy Disk.

The image is subjected to a logical incoming UDF-

check and can be used for direct mastering.

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Sony DVD Rom/DVD Video User Manual Page 19

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