Ventoid turns an Android phone into a practical Ventoy-style USB writer. Plug in a drive over OTG, pick the target device, and prepare bootable media without needing to go back to a PC for the write step.

• OTG-first workflow for rescue kits and field installs
• Direct USB mass-storage writing from Android
• Ventoy-style disk layout with data and EFI partitions
• Clear stage-based install flow for MBR, CORE, DATA, and EFI
• No ads, no analytics, no network dependency

Ventoid should be verifiable by anyone. You can open the project in Android Studio or build it directly with Gradle from the repository root.

1. Clone the repository.
2. Open Ventoid-publish in Android Studio.
3. Let Gradle sync and install any missing Android SDK components it asks for.
4. Build a debug APK from Build > Build Bundle(s) / APK(s) > Build APK(s), or run the app on a device with USB debugging enabled.

On Windows, run these commands from the repository root:

.\gradlew.bat :app:testDebugUnitTest
.\gradlew.bat :app:assembleDebug

If you also want a release build:

.\gradlew.bat :app:assembleRelease

Release signing is optional. If no VENTOID_RELEASE_* environment variables or Gradle properties are set, the release artifact will be generated as an unsigned APK.

• The bundled boot assets are already included in the repository, so no extra download step is required to verify the build.
• The project uses Gradle dependency locking and verification metadata to keep dependency resolution auditable.

Ventoid는 안드로이드 폰에서 OTG로 USB를 연결해 Ventoy 스타일의 부팅 USB를 준비하는 앱입니다. 주변에 PC가 없고 폰만 남아 있는 상황에서 설치 USB나 복구 USB를 다시 만들어야 할 때 쓰기 좋게 설계했습니다.

• PC 없이 설치 USB를 다시 만들어야 할 때
• 현장에서 급하게 부팅 가능한 USB를 준비해야 할 때
• OTG 기반으로 조금 더 간단한 복구 워크플로를 만들고 싶을 때

• 연결된 USB 대용량 저장장치 감지
• 필요한 경우에만 Android USB 권한 요청
• Ventoy 스타일 디스크 레이아웃 작성
• core.img와 EFI 이미지 기록
• 데이터 파티션 exFAT 포맷
• 단계별 진행 상태와 로컬 로그 표시

• 패키지명: com.ventoid.app
• 모듈: app
• 최소 SDK: 21
• 타깃 SDK: 35
• 라이선스: GPL-3.0-only

• app/src/main/java/com/ventoid/app/MainActivity.kt
• app/src/main/java/com/ventoid/app/install/VentoyInstallCoordinator.kt
• app/src/main/java/com/ventoid/app/installer/VentoyInstaller.kt
• app/src/main/java/com/ventoid/app/installer/ExFatFormatter.kt
• app/src/main/java/com/ventoid/app/usb/UsbMassStorageHelper.kt

• app/src/main/assets/boot/boot.img
• app/src/main/assets/boot/core.img
• app/src/main/assets/ventoy/ventoy.disk.img

./gradlew :app:testDebugUnitTest

Ventoid is an Android app for creating Ventoy-style USB drives directly from a phone. It is built for OTG workflows, repair kits, and those moments when your phone is the only working device you have nearby.

• Prepare a bootable USB without a PC
• Rebuild install media in the field
• Keep a cleaner, phone-first workflow for rescue drives

• Detect attached USB mass-storage devices
• Request Android USB permission only when needed
• Write a Ventoy-compatible disk layout
• Write core.img and the EFI image
• Format the data partition as exFAT
• Show stage-based progress and a local write log

• package: com.ventoid.app
• module: app
• min SDK: 21
• target SDK: 35
• license: GPL-3.0-only

• app/src/main/java/com/ventoid/app/MainActivity.kt
• app/src/main/java/com/ventoid/app/install/VentoyInstallCoordinator.kt
• app/src/main/java/com/ventoid/app/installer/VentoyInstaller.kt
• app/src/main/java/com/ventoid/app/installer/ExFatFormatter.kt
• app/src/main/java/com/ventoid/app/usb/UsbMassStorageHelper.kt

• app/src/main/assets/boot/boot.img
• app/src/main/assets/boot/core.img
• app/src/main/assets/ventoy/ventoy.disk.img

./gradlew :app:testDebugUnitTest

Ventoid 是一个可以直接在 Android 手机上准备 Ventoy 风格启动 U 盘的应用。把 U 盘通过 OTG 接到手机上，就能在手机端完成写入，不用再为了这一步特地回到电脑前。

• 手边没有电脑，但需要重新做一个安装盘
• 在现场快速准备恢复或安装用的启动 U 盘
• 想把救援介质的制作流程尽量放到手机上完成

• 识别已连接的 USB 大容量存储设备
• 仅在需要时请求 Android USB 权限
• 写入 Ventoy 风格的磁盘布局
• 写入 core.img 和 EFI 镜像
• 将数据分区格式化为 exFAT
• 显示分阶段进度和本地日志

• 包名: com.ventoid.app
• 模块: app
• 最低 SDK: 21
• 目标 SDK: 35
• 许可证: GPL-3.0-only

• app/src/main/java/com/ventoid/app/MainActivity.kt
• app/src/main/java/com/ventoid/app/install/VentoyInstallCoordinator.kt
• app/src/main/java/com/ventoid/app/installer/VentoyInstaller.kt
• app/src/main/java/com/ventoid/app/installer/ExFatFormatter.kt
• app/src/main/java/com/ventoid/app/usb/UsbMassStorageHelper.kt

• app/src/main/assets/boot/boot.img
• app/src/main/assets/boot/core.img
• app/src/main/assets/ventoy/ventoy.disk.img

./gradlew :app:testDebugUnitTest