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English Description | 中文描述 | APP Description

English Description

Use case:

  • Transfer file between PC and Android without MTP. Mass Storage is more compatible than MTP.
  • Boot from an ISO or PE image for PC system maintenance without burning a disk.

How it works:

This script create a virtual usb flash disk with an image, and mount the image on Android. So that you can access the files in the image on both Android and PC.

The UMSInterface APP is no longer maintained. If you still want to use the APP, refer to the APP Description.

As an alternative, a shell script is provided to realize roughly the same function. This method requires users to have a certain understanding of linux and shell.

Alternative method:

  1. This script is based on Termux environment, please install Termux APP first.

    In order to run the script conveniently, it is recommended to install Termux:Widget.

    In order to show toast messages, Termux:API is needed.

    For new Termux which has no mount command, install mount-utils additionally in Termux by pkg install mount-utils.

  2. Copy mass_storage.sh to /data/data/com.termux/files/home/.shortcuts/.

    Some of the parameters can be modified when needed. For example:

    https://github.com/outofmemo/UMS-Interface/blob/87ce4fe5ae81baaf5a846c680f3fcff3fed9292e/mass_storage.sh#L17

    • default_size_mb: The size(MB) of the image created by default.
    • dst: Mount point path. Leave blank to not mount.
    • src: Image or block device path.
      • You can specify a path that does not exist, and an empty image will be created automatically.
      • You can specify a block device path. DO NOT DO IT, if you have no idea what it means.
      • You can specify an existing image. For example, you can specify an iso image or a PE disk image for PC system maintenance. You can also specify a disk image copied with dd command.

  3. Add executable permissions to mass_storage.sh:

    chmod +x /data/data/com.termux/files/home/.shortcuts/mass_storage.sh

  4. If Termux: Widget is installed, you can add the widget to desktop, so that you can execute the script by clicking the widget.

    Or you can run adb shell am start-activity -n com.termux.widget/.TermuxCreateShortcutActivity to create a shortcut for the script.

    If Termux: Widget is not installed, you can execute the script in Termux: bash /data/data/com.termux/files/home/.shortcuts/mass_storage.sh.

  5. If you want to run this script automatically at boot:

    1. Install Termux:Boot.

    2. Grant Termux:Boot self-start permission in the application settings.

    3. Copy mass_storage.sh to /data/data/com.termux/files/home/.termux/boot, and add executable permissions.

      cp /data/data/com.termux/files/home/.shortcuts/mass_storage.sh /data/data/com.termux/files/home/.termux/boot
chmod +x /data/data/com.termux/files/home/.termux/boot/mass_storage.sh

Notice:

  • After PC writes a file to the USB Driver, Android cannot perceive the file system changes. You can refresh by executing mass_storage.sh again.
  • After Android writes a file to the image or block device, PC cannot perceive the change. You can refresh it by plugging and unplugging the USB or executing mass_storage.sh again.
  • Do not write to the file system at the same time on PC and Android (such as: file movement, copy, rename, create, delete, write), otherwise the file system will be damaged and the file will be lost.
  • Don't store important files in the image or block device used by this script without backup.

中文描述

基本功能: 使用 usb gadget 驱动使指定的镜像或块设备可作为 USB Drive 被PC访问; 同时将此镜像或块设备挂载到Android本地.

使用场景:

  • 摆脱MTP, 实现PC与Android的文件传输, Mass Storage 比 MTP 兼容性更好.
  • 使用已有的iso或pe镜像, 用于PC系统维护, 无需刻盘, 替代PC启动盘.

UMSInterface APP后面不再维护. 如果仍然想使用此APP, 可参考 APP Description.

作为替代, 下面提供一个基于Termux环境的shell脚本示例, 来完成大致相同的功能. 此方法需要使用者对linux和shell有一定的了解.

替代方法如下:

  1. 此shell脚本运行环境基于Termux, 请先安装 Termux.

    同时, 为了方便一键操作, 建议安装 Termux:Widget.

    为了方便显示toast消息, 建议安装 Termux:API.

    较新版本的软件包未自带 mount 命令, 需要在 Termux 中额外安装 mount-utils: pkg install mount-utils.

  2. 将 mass_storage.sh 拷贝至 /data/data/com.termux/files/home/.shortcuts/.

    其中的部分参数可根据实际情况进行修改. 如:

    https://github.com/outofmemo/UMS-Interface/blob/87ce4fe5ae81baaf5a846c680f3fcff3fed9292e/mass_storage.sh#L17

    • default_size_mb: 默认创建的镜像大小, 单位: MB.
    • dst: 挂载点路径. 留空则不挂载.
    • src: 镜像文件或块设备路径.
      • 可以指定一个不存在的路径, 此时会自动创建一个空的镜像.
      • 可以指定一个块设备路径. 但要谨慎这么做, 否则操作失误可能会导致手机无法启动.
      • 可以指定一个已存在的镜像. 比如可以指定iso镜像 或 pe磁盘镜像用于PC的系统维护. 或者也可以指定一个使用dd命令拷贝的磁盘镜像.

  3. 为mass_storage.sh添加可执行权限:

    chmod +x /data/data/com.termux/files/home/.shortcuts/mass_storage.sh

  4. 如果有安装 Termux:Widget, 则可在桌面添加相应的小部件, 点击小部件上的 mass_storage.sh 即可执行此脚本.

    或执行 adb shell am start-activity -n com.termux.widget/.TermuxCreateShortcutActivity 来创建脚本的桌面快捷方式.

    如果没有安装, 可直接在 Termux 中执行此脚本.

  5. 如果希望开机时自动运行此脚本:

    1. 安装 Termux:Boot.

    2. 应用设置中授予 Termux:Boot 自启动权限

    3. 将 mass_storage.sh 拷贝至 /data/data/com.termux/files/home/.termux/boot, 并添加可执行权限.

      cp /data/data/com.termux/files/home/.shortcuts/mass_storage.sh /data/data/com.termux/files/home/.termux/boot
chmod +x /data/data/com.termux/files/home/.termux/boot/mass_storage.sh

注意事项:

  • PC 端向 USB Driver 中写入文件后, Android 无法感知文件系统的变化. 可以通过再次执行 mass_storage.sh 来刷新.
  • 同理, Android 端向镜像或块设备中写入文件后, PC也无法感知文件系统的变化. 可以通过重新插拔USB或再次执行 mass_storage.sh 来刷新.
  • PC 和 Android 端不要同时对文件系统进行写操作(如: 文件的移动, 复制, 重命名, 创建, 删除, 写入), 否则会损坏文件系统, 导致文件丢失.
  • 不要在没有副本的情况下, 把重要文件存放到上述脚本指定的镜像或块设备中.