Sony DADC - Manual (Page 9)

7
DVD-ROM
The first step in formatting is the collection and
preparation of the input materials. You can submit
already formatted data as an image on tape or
leave the formatting of your data to us.
Unformatted data on storage 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 desired 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 cycle 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
communicate 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, particularly with CD-R.
3.1. Data preparation
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 information between a computer
system and dedicated DVD drives or players.
UDF-Bridge stands also for a combination between
the Universal Disc Format ( ISO/IEC 13346 ) and the
ISO 9660 standard.
3.2. Formatting
3. DVD-ROM
ISO 9660:
The ISO 9660 (level 1) file structure is limited to the
characters '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 (including 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 a 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.
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 Leadin-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.
3.3. Input media
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, and therefore the file
structure has to meet the ISO-9660 designation
agreement.