Option Compare Database
Private Const MAX_IDE_DRIVES As Long = 4   ' Max number of drives assuming primary/secondary, master/slave topology
Private Const READ_ATTRIBUTE_BUFFER_SIZE As Long = 512
Private Const IDENTIFY_BUFFER_SIZE As Long = 512
Private Const READ_THRESHOLD_BUFFER_SIZE As Long = 512
Private Const DFP_GET_VERSION As Long = &H74080
Private Const DFP_SEND_DRIVE_COMMAND As Long = &H7C084
Private Const DFP_RECEIVE_DRIVE_DATA As Long = &H7C088
Private Type GETVERSIONOUTPARAMS
    bVersion As Byte       ' Binary driver version.
    bRevision As Byte      ' Binary driver revision.
    bReserved As Byte      ' Not used.
    bIDEDeviceMap As Byte  ' Bit map of IDE devices.
    fCapabilities As Long  ' Bit mask of driver capabilities.
    dwReserved(3) As Long  ' For future use.
End Type
Private Const CAP_IDE_ID_FUNCTION As Long = 1               ' ATA ID command supported
Private Const CAP_IDE_ATAPI_ID As Long = 2                  ' ATAPI ID command supported
Private Const CAP_IDE_EXECUTE_SMART_FUNCTION As Long = 4    ' SMART commannds supported
Private Type IDEREGS
    bFeaturesReg As Byte       ' Used for specifying SMART "commands".
    bSectorCountReg As Byte    ' IDE sector count register
    bSectorNumberReg As Byte   ' IDE sector number register
    bCylLowReg As Byte         ' IDE low order cylinder value
    bCylHighReg As Byte        ' IDE high order cylinder value
    bDriveHeadReg As Byte      ' IDE drive/head register
    bCommandReg As Byte        ' Actual IDE command.
    bReserved As Byte          ' reserved for future use.  Must be zero.
End Type
Private Type SENDCMDINPARAMS
    cBufferSize As Long        ' Buffer size in bytes
    irDriveRegs As IDEREGS     ' Structure with drive register values.
    bDriveNumber As Byte       ' Physical drive number to send
    ' command to (0,1,2,3).
    bReserved(2) As Byte       ' Reserved for future expansion.
    dwReserved(3) As Long      ' For future use.
    bBuffer(0) As Byte         ' Input buffer.
End Type
Private Const IDE_ATAPI_ID As Long = &HA1  ' Returns ID sector for ATAPI.
Private Const IDE_ID_FUNCTION As Long = &HEC  ' Returns ID sector for ATA.
Private Const IDE_EXECUTE_SMART_FUNCTION As Long = &HB0  ' Performs SMART cmd.
Private Const SMART_CYL_LOW As Long = &H4F
Private Const SMART_CYL_HI As Long = &HC2
Private Type DRIVERSTATUS
    bDriverError As Byte       ' Error code from driver,
    bIDEStatus As Byte         ' Contents of IDE Error register.
    bReserved(1) As Byte       ' Reserved for future expansion.
    dwReserved(1) As Long      ' Reserved for future expansion.
End Type
Private Const SMART_NO_ERROR As