1. 1. Overview

This document describes the external specifications of the write-once system "ADDCDW".

1.1 Features

Addendum Write-once system ADDCDW is a system that can repeatedly write to CD-R discs.

(1) It is possible to write to a CD-R disc multiple times.

With a conventional write-once system (SEGA CDW), you can write to a CD-R disc only once. Therefore, even if the amount written was small, the disk could not be reused.
This system can add multiple times to one disc.

(2) Full update of the disc (full addition)

By adding a new disk image file, the contents of the disk can be completely rewritten. In this case, what was previously written will be invisible.

(3) Partial update of disk (additional difference: addition, deletion, replacement)

Once you have written the basic contents such as volume information and directory information to the CD-R disc, you can then write only the programs and data you want to add or change.
This can reduce disc creation time and usage.

(4) Fully upward compatible with SEGA CDW

It includes the functions of SEGACDW, and it is also possible to create a master disk.

(5) Supports on-the-fly writing (from Ver.1.70)

"On-the-fly writing" can be performed in cooperation with the CD builder "XBLD".
On-the-fly burning eliminates the need to create a disk image, saving you time and hard disk space.

1.2 System image

Figure 1.1 System image diagram