| acct | Contains the Cgroup (Control Groups) information, which is used for resource management and accounting. |
| apex | Holds the APEX packages, a container for packaging and managing libraries and apps in a modular way. |
| audit_filter_table | Manages audit rules for logging and monitoring system activities for security and compliance. |
| bin | Contains binary executables, essential command-line tools, and utilities for the system. |
| bugreports | Used for storing system bug reports, logs, and diagnostic information. |
| cache | Temporary storage for application cache files, used to speed up app startup and operation. |
| config | Stores configuration files and permissions for various system components and apps. |
| d | Debug file system, providing access to kernel debugging and diagnostic information. |
| data | Primary storage for user data and application data, including databases, preferences, and files. |
| data_mirror | Used for mirroring data in certain scenarios, like during seamless system updates. |
| debug_ramdisk | Contains the ramdisk image used for debugging and diagnostic purposes. |
| dev | Represents device files that provide access to hardware components and peripherals. |
| dpolicy_system | Specific to device policy management, handling security and policy enforcement. |
| efs | Contains sensitive information related to mobile communication, like IMEI and network details. |
| etc | Holds configuration files and scripts for the system and applications. |
| init | Contains the initial startup scripts and binaries that initialize the system at boot time. |
| init.container.rc | Startup scripts specifically for initializing containerized or isolated environments. |
| init.environ.rc | Defines environment variables and system properties during the boot process. |
| keyrefuge | Secure storage for cryptographic keys and related security parameters. |
| linkerconfig | Configuration files for the dynamic linker, controlling how executable binaries find shared libraries. |
| lost+found | Used by the file system to store recovered files during file system checks (fsck). |
| metadata | Stores metadata used by the system for various purposes, like encryption keys for file-based encryption. |
| mnt | Mount directory, where various file systems and storage devices are mounted and accessed. |
| odm | Vendor-specific configurations and files, part of the device's original design manufacturer data. |
| odm_dlkm | Contains dynamic kernel modules specific to the original device manufacturer. |
| oem | Stores OEM (Original Equipment Manufacturer) specific files and configurations. |
| omr | Reserved for future use, often related to system updates or modular system components. |
| optics | Typically used for storing camera calibration and configuration data. |
| postinstall | Holds scripts and files executed after system updates to finalize installation. |
| prism | Specific to certain devices, used for enhanced UI or system functionalities. |
| proc | Virtual file system providing access to kernel and process information at runtime. |
| product | Contains system files and apps provided by the device manufacturer, similar to system but for product-specific components. |
| sdcard | Mount point for the external SD card, used for additional storage. |
| second_stage_resources | Resources loaded in the second stage of the boot process, like fonts or themes. |
| sepolicy_version | Stores information about the SELinux policy version and configurations. |
| storage | Root directory for user-accessible storage, both internal and external. |
| sys | Provides access to system and device information through the sysfs filesystem. |
| system | Contains the core Android OS files, including system apps and libraries. |
| system_dlkm | Holds dynamic kernel modules for the system, extending kernel functionality. |
| system_ext | Stores system extensions, additional modules, and components outside of the base system partition. |
| vendor | Contains vendor-specific binaries, libraries, and apps, separating them from the core Android OS. |
| vendor_dlkm | Vendor-specific dynamic kernel modules, enhancing or adding hardware support functionalities. |