src/devices/storage/config-example.jd

page.title=Typical Configuration Examples
@jd:body

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<p>Below are examples of external storage configurations as of Android 4.4
for various typical devices. Only the relevant portions of the configuration
files are included.

<h2>Physical primary only (like Nexus One)</h2>

<p>This is a typical configuration for a device with single external storage
device which is a physical SD card.</p>

<p>The raw physical device must first be mounted under
<code>/mnt/media_rw</code> where only the system and FUSE daemon can access
it. <code>vold</code> will then manage the <code>fuse_sdcard0</code> service
when media is inserted/removed.

<h3>fstab.hardware</h3>

<pre><code>[physical device node]  auto  vfat  defaults  voldmanaged=sdcard0:auto,noemulatedsd
</code></pre>

<h3>init.hardware.rc</h3>

<pre><code>on init
    mkdir /mnt/media_rw/sdcard0 0700 media_rw media_rw
    mkdir /storage/sdcard0 0700 root root

    export EXTERNAL_STORAGE /storage/sdcard0

service fuse_sdcard0 /system/bin/sdcard -u 1023 -g 1023 -d /mnt/media_rw/sdcard0 /storage/sdcard0
    class late_start
    disabled
</code></pre>

<h3>storage_list.xml</h3>

<pre><code>&lt;storage
    android:mountPoint="/storage/sdcard0"
    android:storageDescription="@string/storage_sd_card"
    android:removable="true"
    android:primary="true"
    android:maxFileSize="4096" /&gt;
</code></pre>


<h2>Emulated primary only (like Nexus 4)</h2>

<p>This is a typical configuration for a device with single external storage
device which is backed by internal storage on the device.</p>

<h3>init.hardware.rc</h3>

<pre><code>on init
    mkdir /mnt/shell/emulated 0700 shell shell
    mkdir /storage/emulated 0555 root root

    export EXTERNAL_STORAGE /storage/emulated/legacy
    export EMULATED_STORAGE_SOURCE /mnt/shell/emulated
    export EMULATED_STORAGE_TARGET /storage/emulated

on fs
    setprop ro.crypto.fuse_sdcard true

service sdcard /system/bin/sdcard -u 1023 -g 1023 -l /data/media /mnt/shell/emulated
    class late_start
</code></pre>

<h3>storage_list.xml</h3>

<pre><code>&lt;storage
    android:storageDescription="@string/storage_internal"
    android:emulated="true"
    android:mtpReserve="100" /&gt;
</code></pre>


<h2>Emulated primary, physical secondary (like Xoom)</h2>

<p>This is a typical configuration for a device with multiple external
storage devices, where the primary device is backed by internal storage
on the device, and where the secondary device is a physical SD card.</p>

<p>The raw physical device must first be mounted under
<code>/mnt/media_rw</code> where only the system and FUSE daemon can
access it. <code>vold</code> will then manage the <code>fuse_sdcard1</code>
service when media is inserted/removed.</p>

<h3>fstab.hardware</h3>

<pre><code>[physical device node]  auto  vfat  defaults  voldmanaged=sdcard1:auto
</code></pre>

<h3>init.hardware.rc</h3>

<pre><code>on init
    mkdir /mnt/shell/emulated 0700 shell shell
    mkdir /storage/emulated 0555 root root

    mkdir /mnt/media_rw/sdcard1 0700 media_rw media_rw
    mkdir /storage/sdcard1 0700 root root

    export EXTERNAL_STORAGE /storage/emulated/legacy
    export EMULATED_STORAGE_SOURCE /mnt/shell/emulated
    export EMULATED_STORAGE_TARGET /storage/emulated
    export SECONDARY_STORAGE /storage/sdcard1

on fs
    setprop ro.crypto.fuse_sdcard true

service sdcard /system/bin/sdcard -u 1023 -g 1023 -l /data/media /mnt/shell/emulated
    class late_start

service fuse_sdcard1 /system/bin/sdcard -u 1023 -g 1023 -w 1023 -d /mnt/media_rw/sdcard1 /storage/sdcard1
    class late_start
    disabled
</code></pre>

<h3>storage_list.xml</h3>

<pre><code>&lt;storage
    android:storageDescription="@string/storage_internal"
    android:emulated="true"
    android:mtpReserve="100" /&gt;
&lt;storage
    android:mountPoint="/storage/sdcard1"
    android:storageDescription="@string/storage_sd_card"
    android:removable="true"
    android:maxFileSize="4096" /&gt;
</code></pre>