Writing is then fairly straightforward, except for positioning the file pointer by 512-byte sector: long hipart = sect > (32-9) error handling not sure if retrying is useful If (!DeviceIoControl (vol_handle, FSCTL_LOCK_VOLUME, If unable to get write access to a volume or partition, this code forces a dismount if the user authorizes such after a stern warning: if (!DeviceIoControl (vol_handle, FSCTL_DISMOUNT_VOLUME,Įrrormsg ("Error %d attempting to dismount volume: %s", Vol_handle = CreateFile (fn, GENERIC_READ,įILE_SHARE_READ | FILE_SHARE_WRITE, NULL,įILE_FLAG_NO_BUFFERING | FILE_FLAG_RANDOM_ACCESS, Interestingly, the volume access handle is read-only: char fn When it needs to modify an on-disk structure, it dismounts the win32 volume so it can modify NTFS or FAT filesystem structures.
#Access is denied hard disk software
These code snippets are in a proven, mass consumer market software product. In fact it is so counter-intuitive, I spent several days making sure the code does in fact work. While the answer of makes sense, it is not how my code works.
#Access is denied hard disk how to
Or is there anything else that should be set to run the process with Administrator privileges?Ĭan I get write access to raw disk sectors under Vista and Windows 7 in user mode? Raw partition access in Windows Vista How to obtain direct access to raw HD data in C? Is there a clean way to obtain exclusive access to a physical partition under Windows? Still, I get ERROR_ACCESS_DENIED (0x5).ĭo I have to pass something else to CreateFile? I have no idea what security attributes are, I just pass NULL, relevant code is here at line 92, and here at line 48. I also tried to run the executable from an Administrator cmd (started with Ctrl+Shift+Enter, "Administrator:" is in the window title, properly elevated). In the explorer, I set Run as Administrator under Properties > Compatibility > Privilege Level. The CreateFile() and consecutive ReadFile() calls are successful for GENERIC_READ without Administrator privileges.ĬreateFile fails for GENERIC_WRITE even with Administrator privileges. The executable is written in C++ and it calls CreateFile() to open an SD card that has no filesystem.
The relevant Microsoft doc is: Blocking Direct Write Operations to Volumes and Disks CreateFile, remarks on Physical Disks and Volumes
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