如何读取优盘的某个扇区？

比如，我想读取优盘的引导扇区
应该怎么做哪？

我写个看code笔记:
////////////////////////////////////////////////////
//这段就是核心了 :-)
/////////////////////////////////////
// win 2k code
HANDLE hDevice;
DWORD bytesread;

// Creating a handle to drive a: using CreateFile () function ..
char _devicename[] = "\\.\A:"; //这个根据你的需要来,如果你的U盘是K盘, 就是"\\.\K:",硬盘是\\\\.\\PhysicalDrive%d

_devicename[4] += drive;
hDevice = CreateFile( _devicename,
GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);

if (hDevice == INVALID_HANDLE_VALUE)
return false;

// Setting the pointer to point to the start of the sector we want to read ..
SetFilePointer (hDevice, (logicalsector*512), NULL, FILE_BEGIN);

if (!ReadFile (hDevice, secbuf, 512, &bytesread, NULL) )
return false;

给分吧
可读98或2k下读任意磁盘逻辑扇区

bool CFormatDisk::ReadSector(int drive, DWORD logicalsector, unsigned char *secbuf )
{
#pragma pack (1)
struct
{
DWORD StartingSector ;
WORD NumberOfSectors ;
DWORD pBuffer;
}ControlBlock;
#pragma pack ()

#pragma pack (1)
typedef struct _DIOC_REGISTERS
{
DWORD reg_EBX;
DWORD reg_EDX;
DWORD reg_ECX;
DWORD reg_EAX;
DWORD reg_EDI;
DWORD reg_ESI;
DWORD reg_Flags;
} DIOC_REGISTERS ;
#pragma pack ()
DIOC_REGISTERS reg ;
HANDLE hDevice ;
BOOL fResult ;
DWORD cb ;

hDevice = CreateFile ( "\\\\.\\vwin32", 0, 0, NULL, 0, FILE_FLAG_DELETE_ON_CLOSE, NULL );
if ( hDevice == INVALID_HANDLE_VALUE )
{
// win 2k code
HANDLE hDevice;
DWORD bytesread;

// Creating a handle to drive a: using CreateFile () function ..
char _devicename[] = "\\\\.\\A:";

_devicename[4] += drive;
hDevice = CreateFile( _devicename,
GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);

if (hDevice == INVALID_HANDLE_VALUE)
return false;

// Setting the pointer to point to the start of the sector we want to read ..
SetFilePointer (hDevice, (logicalsector*512), NULL, FILE_BEGIN);

if (!ReadFile (hDevice, secbuf, 512, &bytesread, NULL) )
return false;
}
else
{
// code for win 95/98
ControlBlock.StartingSector = (DWORD)logicalsector;
ControlBlock.NumberOfSectors = 1;
ControlBlock.pBuffer =  (DWORD)secbuf ;

//-----------------------------------------------------------
// SI contains read/write mode flags
// SI=0h for read and SI=1h for write
// CX must be equal to ffffh for
// int 21h's 7305h extention
// DS:BX -> base addr of the
// control block structure
// DL must contain the drive number
// (01h=A:, 02h=B: etc)
//-----------------------------------------------------------

reg.reg_ESI = 0x00 ;
reg.reg_ECX = -1 ;
reg.reg_EBX = (DWORD)(&ControlBlock);
reg.reg_EDX = drive+1;
reg.reg_EAX = 0x7305 ;

//  6 == VWIN32_DIOC_DOS_DRIVEINFO
fResult = DeviceIoControl ( hDevice,
6,
&(reg),
sizeof (reg),
&(reg),
sizeof (reg),
&cb,
0);

if (!fResult || (reg.reg_Flags & 0x0001)) return false;
}

CloseHandle(hDevice);
return true;
}

优盘的盘符和硬盘的盘符是不同的。
如果把物理盘看成设备的话，
优盘对应的设备符号是什么？
硬盘对应的设备符号是什么？

能否说的详细一点，优盘的设备符该怎么读取？

[quote]做法和读取硬盘的扇区没有区别.
CreateFile
SetFilePointer
ReadFile就可以了

[/quote]

能否说的详细一点，优盘的设备符该怎么读取？

[quote]做法和读取硬盘的扇区没有区别.
CreateFile
SetFilePointer
ReadFile就可以了

[/quote]
设备符跟引导扇区不是一类东西。
把问题说清楚一点，到底想读取什么。谢谢。

能否说的详细一点，优盘的设备符该怎么读取？

做法和读取硬盘的扇区没有区别.
CreateFile
SetFilePointer
ReadFile就可以了

做法和读取硬盘的扇区没有区别.
CreateFile
SetFilePointer
ReadFile就可以了

也许可以发个CBW，模拟read10命令就能读取u盘所有信息了
通过bulkin口

WinHex