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    <p>First of all, I think that you may need to umount <code>.android_secure</code> filesystem before formatting SD card, whatever your approach may be.</p> <p>Then,</p> <p>Try including following permissions in your app:</p> <p>1) <code>MOUNT_FORMAT_FILESYSTEMS</code> - <a href="http://developer.android.com/reference/android/Manifest.permission.html#MOUNT_FORMAT_FILESYSTEMS" rel="nofollow">http://developer.android.com/reference/android/Manifest.permission.html#MOUNT_FORMAT_FILESYSTEMS</a></p> <p>2) <code>MOUNT_UNMOUNT_FILESYSTEMS</code> - <a href="http://developer.android.com/reference/android/Manifest.permission.html#MOUNT_UNMOUNT_FILESYSTEMS" rel="nofollow">http://developer.android.com/reference/android/Manifest.permission.html#MOUNT_UNMOUNT_FILESYSTEMS</a></p> <p>Android Settings app already uses the 2nd permission.</p> <p>================================================================================</p> <p>When you perform a build of AOSP or any other distribution code, IMountService.java file gets generated automatically. It contains following function which actually sends formatting commands to vold daemon I guess.:</p> <pre><code>private static class Proxy implements android.os.storage.IMountService { private android.os.IBinder mRemote; Proxy(android.os.IBinder remote) { mRemote = remote; } public android.os.IBinder asBinder() { return mRemote; } // **** A LOT OF OTHER CODE IS HERE..... public int formatVolume(java.lang.String mountPoint) throws android.os.RemoteException { android.os.Parcel _data = android.os.Parcel.obtain(); android.os.Parcel _reply = android.os.Parcel.obtain(); int _result; try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(mountPoint); mRemote.transact(Stub.TRANSACTION_formatVolume, _data, _reply, 0); _reply.readException(); _result = _reply.readInt(); } finally { _reply.recycle(); _data.recycle(); } return _result; } } </code></pre>
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    1. POFormat SD card in Android
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    1. COGot it, about permissions, but still no idea how to implement the actual format operations. Thanks for your answer.
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    2. COAre you planning to use root (su) privileges in your app?
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    3. COThe mount service has a check for MOUNT_UNMOUNT_FILESYSTEMS in code. Another possibility is that system apps are signed with "platform" key which can't be replicated for normal apps.
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