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    C++ - Read Bytes of Hard Drive

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    asma
    The document discusses reading bytes directly from a hard drive in C++ on Windows 7. It provides code to open a handle to the physical hard drive device, set the file pointer to the beginning, and read bytes into a buffer. The code uses Windows API functions CreateFile, SetFilePointerEx, and ReadFile. Admin privileges are required to read from the physical disk.

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    C++ - Read Bytes of Hard Drive

    Uploaded by

    asma
    241 views1 page
    The document discusses reading bytes directly from a hard drive in C++ on Windows 7. It provides code to open a handle to the physical hard drive device, set the file pointer to the beginning, and read bytes into a buffer. The code uses Windows API functions CreateFile, SetFilePointerEx, and ReadFile. Admin privileges are required to read from the physical disk.

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    c++ - Read bytes of hard drive

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    c++ - Read bytes of hard drive

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    The document discusses reading bytes directly from a hard drive in C++ on Windows 7. It provides code to open a handle to the physical hard drive device, set the file pointer to the beginning, and read bytes into a buffer. The code uses Windows API functions CreateFile, SetFilePointerEx, and ReadFile. Admin privileges are required to read from the physical disk.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    241 views1 page

    C++ - Read Bytes of Hard Drive

    Uploaded by

    asma
    The document discusses reading bytes directly from a hard drive in C++ on Windows 7. It provides code to open a handle to the physical hard drive device, set the file pointer to the beginning, and read bytes into a buffer. The code uses Windows API functions CreateFile, SetFilePointerEx, and ReadFile. Admin privileges are required to read from the physical disk.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    12/28/2017 c++ - Read bytes of hard drive - Stack Overflow

    Read bytes of hard drive

    Using the hex editor HxDen one can read (and edit) the bytes on the hard drive or a USB key or the RAM. That is, one can read/change the first
    byte on the hard disk.

    I understand how to read the bytes from a file using C++, but I was wondering how one might do this for the hard disk.

    To make it simple, given a positive integer n, how can I read byte number n on the hard drive using C++? (I would like to do C++, but if there is
    an easier way, I would like to hear about that.)

    I am using MinGW on Windows 7 if that matters.

    c++ windows hard-drive read-write

    edited May 23 at 10:29 asked Dec 22 '13 at 1:47


    Community ♦ Thomas
    1 1 530 2 10 29

    Maybe this will help.. stackoverflow.com/questions/7289453/… – Half_Baked Dec 22 '13 at 1:50

    @Half_Baked He's on Windows 7 (and yes, that matters) – sehe Dec 22 '13 at 1:54

    @sehe: You might say the advice was... half baked? – Joe Z Dec 22 '13 at 1:55

    I edited the question after Half_Baked wrote his comment.... (sorry) – Thomas Dec 22 '13 at 1:55

    I'd start with `\\physicaldevice` (search: stackoverflow.com/search?q=physicaldevice) – sehe Dec 22 '13 at


    1:58

    1 Answer

    It is documented in the MSDN Library article for CreateFile, section "Physical Disks and
    Volumes". This code worked well to directly read the C: drive:

    HANDLE hdisk = CreateFile(L"\\\\.\\C:",


    GENERIC_READ,
    FILE_SHARE_READ | FILE_SHARE_WRITE,
    nullptr,
    OPEN_EXISTING,
    0, NULL);
    if (hdisk == INVALID_HANDLE_VALUE) {
    int err = GetLastError();
    // report error...
    return -err;
    }

    LARGE_INTEGER position = { 0 };
    BOOL ok = SetFilePointerEx(hdisk, position, nullptr, FILE_BEGIN);
    assert(ok);

    BYTE buf[65536];
    DWORD read;
    ok = ReadFile(hdisk, buf, 65536, &read, nullptr);
    assert(ok);
    // etc..

    Admin privileges are required, you must run your program elevated on Win7 or you'll get error
    5 (Access denied).

    answered Dec 22 '13 at 2:29


    Hans Passant
    732k 100 1166
    1876

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    https://stackoverflow.com/questions/20725397/read-bytes-of-hard-drive 1/1

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