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The SDCard may be formatted ext3 or YAFFS (citation needed - verify example) The SDCard may be formatted ext3 or YAFFS, or ext4.In December 2010 it was announced "Ext4 filesystem hits Android," Google's new Nexus S smartphone is the first Android device to use the Ext4 filesystem. Ext4 developer Ted T'so claims it is less prone to data loss. Previously, most Androids used YAFFS, a lightweight filesystem that is optimized for flash storage and is commonly used in mobile and embedded devices.== SDCard ==Ext4 is considered a breakthrough for Android devices, with increased data integrity and quicker data read/write access. == File System Overview == The file system structure of Android devices shares some similarities with Linux, and has some peculiar traits unique to Android. Many applications search the entire sdcard for data files, for example, a common music player will search the entire SD Card for all audio files, including .mp3 files. This can be undesirable for (a) purists that wish to have certain files for certain purposes in specific organized and standardized places and (b) people that have audio files in certain folders they do not want showing up in the new media player just installed. It is true that Android blows away file system and storage convention, by trying to make it seem as if there is no need for structure of the file system. The design is supposed to be a "stick it in and it just finds the stuff and works" designed for the lowest common denominator. Unfortunately, a lot of technology is heading down this zombie minded road. Linux users are also familiar with partitions versus directories. Some directories visible via the file manager (or ls command on linux) may be mounted partitions. A good article reference to read is: [http://www.addictivetips.com/mobile/android-partitions-explained-boot-system-recovery-data-cache-misc/ Android Partitions Explained: boot, system, recovery, data, cache & misc] by an author named By Haroon Q. Raja. === Hiding Media Files === If you have a folder with files, such as .mp3 files, and you don't want them to appear to applications that scan the entire card contents, just put a .nomedia file in the folder and it wont see them. Save a null file as “.nomedia” and make sure that the Save as type is set as “All Files” instead of “Text documents.” Copy that file to the folder on your SD card containing audio files you don’t want to show up. You may have to reboot the Android after doing this. Also, any folder whose name begins with a period, such as .secretmedia, will be invisible to scanning software also. A folder beginning with a period in the Linux / Android world is like a folder with the hidden attribute set in the Windows world. The Linux console command to quickly create the null .nomedia file is: touch .nomedia === SDCard ===== DCIM ===== DCIM ===== External Storage Public Directory ===== External Storage Public Directory === Some people are using a "media" intermediary directory between the standard public directory and the storage root. See below * /sdcard/media/alarms OR /sdcard/Alarms * /sdcard/media/notifications OR /sdcard/notifications* /sdcard/media/ringtones OR /sdcard/ringtones* /sdcard/media/ui OR /sdcard/ui Warning: This may be incorrect. Below is from the Android developer's reference explaining the correct way. === App Installation path ===Preinstalled applications are in /system/app folder. User installed applications are in /data/app # /data/app# /data/app-private# /system/app/# /sdcard/.android_secure (shows .asec files, not .apks) On Samsung phones: /sdcard/external_sd/.android_secure In Android 7.0 and before, after an APK is installed, it will be located in /data/app path. In Android 7.0, the APK file will be installed into the /data/app/<package name>-<num>/ folder, where the <package name> is the package name of the APK, and the num may be 1 or 2. /data/app/com.king.candycrushsaga-1/base.apk == File System Tree == {{:Afs:Android File System Tree}}