非常棘手的问题，90分相送

我把论坛上tiamo的虚拟磁盘修改了一下 ，
tiamo的虚拟磁盘把大文件拷贝到磁盘时没有问题，
我想把磁盘的数据存到数据库 ，但是 当文件比较大 ，超过 20M
系统就死了 。小文件操作没问题。不知道啥原因 。

与算法等应该没关系，因为我就在tiamo的 写磁盘的函数里面
加了一段tdi发包函数代码 如下：只是往数据库写数据，但是文件比较大的时候，系统就死了。

for ( i=0; i<Count; i++) {
// 发送WRITE_CMD
write_cmd.cmd_id = 0x2a;
Start =StartLBA+512*i;
write_cmd.start_lba = htonl(Start);
DbgPrint ( \"TDI Rwrite: %d\\n\", Start);
// 拷贝数据

if ( left >= BlockSize) {
RtlCopyMemory(write_cmd.sector, (UCHAR *)(pSrb->DataBuffer)+i*BlockSize, BlockSize);
write_cmd.write_len = htonl(BlockSize);
devDebugPrint(\"write %d bytes:\\n\", BlockSize);


status = ZwWriteFile(pExt->m_hFileHandle[pSrb->TargetId],NULL,NULL,NULL,&ioStatus,(UCHAR *)(pSrb->DataBuffer)+i*BlockSize,
BlockSize,&pos,NULL);
pos.QuadPart+=BlockSize;
// DbgPrint ( \"TDI Rwrite: %d\\n\",  ntohs(pos.QuadPart));
left -= BlockSize;
        }
        else {
RtlCopyMemory(write_cmd.sector, (UCHAR *)(pSrb->DataBuffer)+i*BlockSize, left);
write_cmd.write_len = htonl(left);

status = ZwWriteFile(pExt->m_hFileHandle[pSrb->TargetId],NULL,NULL,NULL,&ioStatus,(UCHAR *)(pSrb->DataBuffer)+i*BlockSize,
left,&pos,NULL);
left =0;
}

len = sizeof(write_cmd);
dStatus = TdiSendDatagram ( // send datagram
pTdiTransportObject, // to transport
MY_PORT, // port
dTdiAddress, // address
&write_cmd, // data
len ); // size
if ( !NT_SUCCESS ( dStatus ) )
DbgPrint ( \"ERROR: writing sending %X\\n\", dStatus );
else
DbgPrint ( \"writing send success\\n\" );

// 接收确认
len = sizeof(pExt->buf);
dStatus = TdiReceiveDatagram (
pTdiTransportObject, // to transport
MY_PORT, // port
&dTdiAddress, // address
pExt->buf, // buffer
&len ); // buffer size
DbgPrint ( \"TDI receive len: %d\\n\", len);
if ( NT_SUCCESS ( dStatus ) )
DbgPrint ( \"writing rec: success\\n\");
else
DbgPrint ( \"ERROR: writing \\n\" );

}

这样看代码是乎没有问题