If you don't have /etc/vold.fstab, you can set SDCARD variable in the kernel command line (/proc/cmdline) to control the behavior of vold.If you have the configuration file /etc/vold.fstab, it reads and mounts the device specified in the file, as a normal Android's vold.Besides, if you don't have a real USB disk or SD card, it can simulate a fake sdcard to work smoothly with applications that need sdcard. That is, it can automatically detect any USB mass storage or MMC/SD card and mount it as the sdcard. The Android-x86 project has extended the functions of the new vold to support auto-mount feature without a configuration file. It is not suitable for x86 platforms with variable device names. However, a fixed vold.fstab can only support block device with fixed name. ![]() See system/core/rootdir/etc/vold.fstab in the Android source tree for the detailed explanations of the format. The configuration is changed to /etc/vold.fstab and its format is also changed. Since Android 2.2 (froyo), it ships with a new implementation of vold (aka vold2). Before Android 2.1 (included), the file is /etc/nf. The mount daemon needs a configuration file to tell it what the sdcard device is. The Android system uses vold as the mount daemon, which detects, mounts and monitors the status of sdcard.
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