Editing DVD-RAM (section)

==Specification==
{{multiple image
 | align = right
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 | header = 
 | image1 = DVD-RAM Detail Sectors.jpg
 | caption1 = A DVD-RAM disc can be identified by many small rectangles distributed on the surface of the data carrier
 | image2 = Dvd-ram-closeup.jpg
 | caption2 = These rectangles constitute the hard (factory originated) sectoring of the DVD-RAM
}}

=== Recording speeds ===
Since the Internationale Funkausstellung Berlin 2003 the specification is being marketed by the ''RAM Promotion Group'' (RAMPRG), built by [[Hitachi, Ltd.|Hitachi]], [[Toshiba]], [[Maxell]], [[LG Electronics]], [[Panasonic Corporation|Matsushita/Panasonic]], [[Samsung]], [[Lite-On]] and [[Teac]]. The specification distinguishes between:

* DVD-RAM version 1.0 (1997), recording speed 1x<br>– Defines discs with capacity of 2.58&nbsp;GB per side (24 track zones) (see also: [[DVD#Capacity|DVD Capacity]])
* DVD-RAM version 2.0 (1999), recording speed 2x<br>– Defines discs with more common capacity of 4.7&nbsp;GB per side (35 track zones)
* DVD-RAM version 2.1 (2000)<br>– Introduces 8-cm discs with capacity of 1.46&nbsp;GB per side (14 track zones){{sfn|Taylor|2001|pp=148, 228}}<ref name="Supplementary"/>
* DVD-RAM version 2.2 (2004) divides drives and discs into two classes due to breaking compatibility:<ref name="Supplementary"/><ref name=DvdForumNotice/><br> – Class 0, recording speed 2x/3x/5x<br> – Class 1, recording speed 6x/8x/12x/16x (DVD-RAM2)

Speeds more than 2x are defined by Optional Specifications (Nx-speed DVD-RAM):<ref name="Supplementary"/><ref>{{cite web |url=https://www.dvdfllc.co.jp/pdf/bookcon2009-02rev.pdf |title=DVD Book Construction |website=DVD FLLC |access-date=2019-12-16}}</ref>
* Rev. 1.0 (2002) - 3x-speed
* Rev. 2.0 (2004) - 5x-speed
* Rev. 3.0 (2005) - 6x-speed
* Rev. 4.0 (2005) - 8x-speed
* Rev. 5.0 (2005) - 12x-speed
* Rev. 6.0 (2005) - 16x-speed (never released)

=== Diameters ===
DVD-RAM discs can have 12 or 8 cm in diameter, around 5 or 3 inches respectively. The latter variant is mainly intended for [[camcorders]] that use DVD as storage media and also exists with capacities of 1.46 GB for a single-sided disc, 2.8 GB for a double-sided disc, and 5.6 GB for a dual-layer double sided disc, however, they are relatively uncommon.
DVD-RAMs were originally solely sold in disc caddy [[caddy (hardware)|cartridge]]s; recent DVD recorders can work with discs either with or without a cartridge, and many devices do not work with cartridges. Discs can be removed from cartridges for use with these drives (except with type 1 media, see table above).

=== Cartridge types ===
{| class="wikitable"
|+DVD-RAM cartridge types<ref>{{cite web |url=https://www.dvddemystified.com/dvdfaq.html#4.3.4.1 |title=DVD FAQ - What are the DVD-RAM cartridge types? |last=Taylor |first=Jim |website=DVD Demystified |access-date=2019-12-15}}</ref>
|-
! Size
| colspan=2 style="text-align: center" | Bare disc
| colspan=2 style="text-align: center" | Non-removable cartridge
| colspan=2 style="text-align: center" | Removable cartridge
| colspan=2 style="text-align: center" | Empty cartridge/no disc
|-
| ''sides''
| ''single''
| ''double''
| ''single''
| ''double''
| ''single''
| ''double''
| ''single''
| ''double ''
|-
| '''12&nbsp;cm'''
| yes (type 0)
| none
| type 1
| type 1
| type 2
| type 4
| type 3
| type 5
|-
| '''8&nbsp;cm'''
| yes (type 0)
| none
| none
| none
| type 7
| type 6
| type 9
| type 8
|}