[Android]device layout partitions introduction

[Android]device layout partitions introduction

The flash space on an Android device typically contains the following partitions.
bootContains the Linux kernel and a minimal root filesystem (loaded into a RAM disk). It mounts system and other partitions and starts the runtime located on the system partition.systemContains system applications and libraries that have source code available on Android Open Source Project (AOSP). During normal operation, this partition is mounted read-only; its contents change only during an OTA update.vendorContains system applications and libraries that do not have source code available on Android Open Source Project (AOSP). During normal operation, this partition
is mounted read-only; its contents change only during an OTA update.userdataStores the data saved by applications installed by the user, etc. This partition is not normally touched by the OTA update process.cacheTemporary holding area used by a few applications (accessing this partition requires special app permissions) and for storage of downloaded OTA update packages. Other programs use this space with the expectation that files
can disappear at any time. Some OTA package installations may result in this partition being wiped completely.recoveryContains a second complete Linux system, including a kernel and the special recovery binary that reads a package and uses its contents to update the other partitions.miscTiny partition used by recovery to stash some information away about what it's doing in case the device is restarted while the OTA package is being applied.