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<concept id="GUID-9540A82E-F83D-55F5-B441-868CF77468E9" xml:lang="en"><title>Media

Driver Overview</title><shortdesc>Describes the media drivers used in Symbian platform. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-507A567D-6AD4-4340-9A3F-35A5751D07F0"><title>Purpose</title> <p id="GUID-CFED15B1-E768-534E-9043-7AADE45EE9AF"> Provides an interface between

the peripherals and the kernel. </p> </section>

<section id="GUID-1CA022A4-BA5B-4B57-9245-712CA3868E22"><title>Required background</title> <p>This

section discusses what you need to do to write or port a media driver. It

assumes that you are familiar with the Symbian platform device driver model. </p> </section>

<section id="GUID-095C852B-8AF7-4035-A078-ACA2CFF3B7BC"><title>Key concepts

and terms</title> <dl>

<dlentry>

<dt>Physical Device Driver (PDD)</dt>

<dd><p>Physical Device Driver is a driver that is specific to one type of

a device. </p> </dd>

</dlentry>

<dlentry>

<dt>NAND</dt>

<dd><p>NAND is a device that contains NAND flash memory or NAND flash controller. </p> </dd>

</dlentry>

<dlentry>

<dt>MultimediaCard (MMC)</dt>

<dd><p>The MultiMediaCard (MMC) is a flash memory card standard. </p> </dd>

</dlentry>

</dl> </section>

<section id="GUID-4F50C492-1FA4-475F-B896-050B158E347E"><title>Architecture</title> <p>The

media driver is a special form of physical device driver. The class <xref href="GUID-A0D4EB25-0BA4-39EE-874B-465EB9628DCC.dita"><apiname>DMediaDriver</apiname></xref> is

the abstract base class from which all the media drivers are derived. These

media drivers have associated libraries that manage storage media hardware.

Some media drivers have platform specific layers that a base port can implement

for particular type of storage hardware. The media drivers are loaded and

used by file server. </p> </section>

<section id="GUID-8DC5D361-7A97-4493-B25E-126BC3EE34D6"><title>Media Drivers

Summary</title> <p>Media drivers provides the following physical device drivers

for the user: </p> <ul>

<li id="GUID-7DE4C0BD-3C5F-56A2-9F25-862BCF48C956"><p> <b>Internal RAM Drive

Media Driver</b>  </p> <p> <filepath>medint.pdd</filepath>  </p> <p>Internal

Ram Drive media driver is a physical device driver meant for growing and shrinking

the RAM drive. </p> </li>

<li id="GUID-D9930EA1-CC68-58E6-8B48-722AFC0750D7"><p> <b>ATA Card Media Driver</b>  </p> <p> <filepath>medata.pdd</filepath>  </p> <p>ATA

Card media driver is a physical driver to access ATA cards. </p> </li>

<li id="GUID-3607FA5E-AC5C-5716-867B-B665872DA047"><p> <b>MultiMediaCard Media

Driver</b>  </p> <p> <filepath>medmmc.pdd</filepath>  </p> <p>MultiMediaCard

media driver is a physical driver which requests services from the MultiMediaCard

controller. </p> </li>

<li id="GUID-0304B5F7-7256-5160-9F52-C97FE8B6C2D4"><p> <b>Nand Media Driver</b>  </p> <p> <filepath>mednand.pdd</filepath>  </p> <p>NAND

media driver is a physical device driver to access the NAND device. </p> </li>

<li id="GUID-8F6BB0BC-CEBB-5807-B481-253C50750328"><p> <b>LFS Media Driver</b>  </p> <p> <filepath>medlfs.pdd</filepath>  </p> <p>The

LFS media driver is a physical device driver that reads and writes to NOR

type flash memory. </p> </li>

</ul> </section>

</conbody><related-links>

<link href="GUID-E21C4AF8-852A-5BBD-A92A-5473D1DFFBB1.dita"><linktext>Media Driver

                Tutorial</linktext></link>

</related-links></concept>