Option Explicit

''''/////////////////////////////////////////
''''// 对磁盘的物理扇区数据读/写操作
''''// last update: 2004-8-7
''''// Kwanhong Young
''''/////////////////////////////////////////

''''//file system
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Long) As Long ''''//declare has changed
Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, ByVal lpOverlapped As Long) As Long ''''//declare has changed
Private Declare Function SetFilePointer Lib "kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long

Private Const GENERIC_READ = &H80000000
Private Const GENERIC_WRITE = &H40000000

Private Const FILE_SHARE_READ = &H1
Private Const FILE_SHARE_WRITE = &H2
Private Const OPEN_EXISTING = 3

Private Const INVALID_HANDLE_VALUE = -1

''''//file seek
Private Const FILE_BEGIN = 0
Private Const FILE_CURRENT = 1
Private Const FILE_END = 2

Private Const ERROR_SUCCESS = 0&

''''//device io control
Private Declare Function DeviceIoControl Lib "kernel32" (ByVal hDevice As Long, ByVal dwIoControlCode As Long, lpInBuffer As Any, ByVal nInBufferSize As Long, lpOutBuffer As Any, ByVal nOutBufferSize As Long, lpBytesReturned As Long, ByVal lpOverlapped As Long) As Long

Private Const IOCTL_DISK_GET_DRIVE_GEOMETRY As Long = &H70000   ''''458752
Private Const IOCTL_STORAGE_GET_MEDIA_TYPES_EX  As Long = &H2D0C04
Private Const IOCTL_DISK_FORMAT_TRACKS As Long = &H7C018
Private Const FSCTL_LOCK_VOLUME As Long = &H90018
Private Const FSCTL_UNLOCK_VOLUME As Long = &H9001C
Private Const FSCTL_DISMOUNT_VOLUME As Long = &H90020
Private Const FSCTL_GET_VOLUME_BITMAP = &H9006F

''''//type
Private Type LARGE_INTEGER
    lowpart As Long
    highpart As Long
End Type

Private Enum MEDIA_TYPE
    Unknown
    F5_1Pt2_512
    F3_1Pt44_512
    F3_2Pt88_512
    F3_20Pt8_512
    F3_720_512
    F5_360_512
    F5_320_512
    F5_320_1024
    F5_180_512
    F5_160_512
    RemovableMedia
    FixedMedia
End Enum

Private Type DISK_GEOMETRY
    Cylinders           As LARGE_INTEGER
    MediaType           As MEDIA_TYPE
    TracksPerCylinder   As Long
    SectorsPerTrack     As Long
    BytesPerSector      As Long
End Type

''''//private vars
Private hDisk           As Long             ''''disk handle
Private lpGeometry      As DISK_GEOMETRY    ''''disk info
Private lBufferSize     As Long             ''''the buffer size of read/write

Public Function OpenDisk(ByVal FileName As String) As Boolean
''''// 打开磁盘
    hDisk = CreateFile(FileName, _
                        GENERIC_READ Or GENERIC_WRITE, _
                        FILE_SHARE_READ Or FILE_SHARE_WRITE, _
                        ByVal 0&, _
                        OPEN_EXISTING, _
                        0, _
                        0)
    OpenDisk = Not (hDisk = INVALID_HANDLE_VALUE)
End Function

Public Function CloseDisk() As Boolean
''''//关闭磁盘
    CloseDisk = CloseHandle(hDisk)
End Function

Public Function GetDiskGeometry() As Boolean
''''//获取磁盘参数
    Dim dwOutBytes      As Long
    Dim bResult         As Boolean
   
    bResult = DeviceIoControl(hDisk, _
                                IOCTL_DISK_GET_DRIVE_GEOMETRY, _
                                ByVal 0&, 0, _
                                lpGeometry, Len(lpGeometry), _
                                dwOutBytes, _
                                ByVal 0&)
   
    If bResult Then lBufferSize = lpGeometry.BytesPerSector * lpGeometry.SectorsPerTrack
    GetDiskGeometry = bResult
End Function

Public Sub GetDiskInfo(MediaType As Long, _
                        Cylinders As Long, _
                        TracksPerCylinder As Long, _
                        SectorsPerTrack As Long, _
                        BytesPerSector As Long)
''''//返回磁盘的参数
    MediaType = lpGeometry.MediaType
    Cylinders = lpGeometry.Cylinders.lowpart
    TracksPerCylinder = lpGeometry.TracksPerCylinder
    SectorsPerTrack = lpGeometry.SectorsPerTrack
    BytesPerSector = lpGeometry.BytesPerSector

End Sub

Public Property Get BufferSize() As Long
''''//返回每次读/写的缓冲大小
    BufferSize = lBufferSize
End Property

Public Function LockVolume() As Boolean
''''// 将卷锁定
    Dim dwOutBytes  As Long
    Dim bResult     As Boolean
   
    bResult = DeviceIoControl(hDisk, _
                                FSCTL_LOCK_VOLUME, _
                                ByVal 0&, 0, _
                                ByVal 0&, 0, _
                                dwOutBytes, _
                                ByVal 0&)
    LockVolume = bResult
End Function

Public Function UnlockVolume() As Boolean
''''// 将卷解锁
    Dim dwOutBytes As Long
    Dim bResult As Boolean
   
    bResult = DeviceIoControl(hDisk, _
                                FSCTL_UNLOCK_VOLUME, _
             

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