何謂DVD RAM Drive?

因為你裝了incd, 將 RW 碟轉成了像HARDDISK 的可讀,可洗的DVD 盤,
但 RW 的結構和DVD-RAM 是不同的, RW 若寫了東西時, 要FORMAT 了隻碟後才寫
但DVD-RAM 便不需了,

及 DVD 需要 CLOSE SESSION 才可使用, 不能抄FILES 落DVD 直接看
, 要 用NERO 燒

DVD-RAM (DVD–Random Access Memory) is a disc specification presented in 1996 by the DVD Forum, which specifies rewritable DVD-RAM media and the appropriate DVD writers. DVD-RAM media have been used in computers as well as camcorders and personal video recorders since 1998.

Introduction
Currently there are three competing technologies for rewritable DVDs: DVD-RAM, DVD+RW and DVD-RW. DVD-RAM is considered a highly reliable format, as the discs have built-in error control and a defect management system. Therefore, DVD-RAM is perceived to be better than the other DVD technologies for traditional computer usage tasks such as general data storage, backup and archival, though the Mt. Rainier standard for DVD+RW somewhat lessens the DVD-RAM format's perceived advantage. Curiously, DVD-RAM has a larger presence in camcorders and set-top boxes than in computers, although the DVD-RAM's popularity in these devices can be explained by the fact that it is very easily written to and erased, which for example allows extensive in-camera editing.

The on-disc structure of DVD-RAMs is closely related to hard disk and floppy disk technology, as it stores data in concentric tracks. DVD-RAMs can be accessed just like a hard or floppy disk and usually without any special software. DVD-RWs and DVD+RWs, on the other hand, store data in one long spiral track and require special packet reading/writing software to read and write data discs. It is a common misconception that DVD-RAM uses magneto-optical (MO) technologies: DVD-RAM is a pure phase change medium, similar to CD-RW or DVD-RW.

DVD-RAM Cartridge types
Size Bare Disc Non-removable Disc Removable Disc Empty Cartridge
sides single double single double single double single double
12 cm yes
(type 0) none type 1 type 1 type 2 type 4 type 3 type 5
8 cm yes
(type 0) none none none type 7 type 6 type 9 type 8


Specification

A DVD-RAM Type 2.Since the Internationale Funkausstellung Berlin 2003 the specification is being marketed by the RAM Promotion Group (RAMPRG), built by Hitachi, Toshiba, Maxell, LG Electronics, Matsushita/Panasonic, Samsung and Teac.

The specification distinguishes between

DVD-RAM version 1.0, recording speed 1x
Single-sided, one layer discs with a capacity of 2.58 GB
Double-sided one layer discs with a capacity of 5.16 GB
DVD-RAM version 2.0, recording speed 2x
Single-sided, one layer discs with a capacity of 4.7 GB
Double-sided one layer discs with a capacity of 9.4 GB
DVD-RAM version 2.1/Revision 1.0, recording speed 3x
DVD-RAM version 2.2/Revision 2.0, recording speed 5x
DVD-RAM version ?/Revision 3.0, recording speed 6x max
DVD-RAM version ?/Revision 4.0, recording speed 8x max
DVD-RAM version ?/Revision 5.0, recording speed 12x max
DVD-RAM version ?/Revision 6.0, recording speed 16x max
Physically smaller, 80 mm in diameter, DVD-RAM discs also exist with a capacity of 1.46 GB for a single-sided disc, but they are uncommon. DVD-RAMs were originally solely sold in cartridges; recent DVD recorders however also work with no-cartridge discs – some devices even do not support cartridges anymore. A cartridge disc is about 50% more expensive than a disc without a cartridge.

Compatibility
Many operating systems like Mac OS (Mac OS 8.6 or later), Linux and Microsoft Windows XP support DVD-RAM operation directly, while earlier versions of Windows require device drivers or the program InCD. The optical drives shipped with most Apple Macintosh computers do not support DVD-RAM operation, but a third party DVD-RAM-compatible drive can be connected and used directly with Mac OS.