how to write data into disk physical memory directly using C in windows

[Venkadesh_M]

I want to directly access the physical sectors of a memory card using C in windows. How can i do this? Also i dont worry about the file system. I want to make the card compatible with my micro controller..

If this post is not relevent to this topic, moderators please do consider.

Thanks in advance..!

 

[Venkadesh_M]

I got a way to do that,

Code C - [expand]

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#include <windows.h> #include <stdio.h> #include <conio.h> #pragma pack( 1 ) struct boot { BYTE jump [ 3 ] ; char bsOemName [ 8 ] ; WORD bytesperSector ; BYTE sectorspercluster ; WORD sectorsreservedarea ; BYTE copiesFAT ; WORD maxrootdirentries ; WORD totalSectors ; BYTE mediaDescriptor ; WORD sectorsperFAT ; WORD sectorsperTrack ; WORD sides ; WORD hiddenSectors ; char reserve [ 480 ] ; } ; void ReadSector ( char*src, int ss, int num, void* buff ) ; void display_buff(char *); **** unsigned char *ptr; **** **** int i, j, k; **** **** struct boot b ; void main() { **** ****ReadSector ( "\\\\.\\F:", 0, 1, &b ) ; **** ****printf ( "Boot Sector name: %s\n", b.bsOemName ) ; ****printf ( "Bytes per Sector: %d\n", b.bytesperSector ) ; ****printf ( "Sectors per Cluster: %d\n", b.sectorspercluster ) ; ****printf ( "jump : %c%c%c\n",************b.jump[0], b.jump[1], b.jump[2] ); ****printf ( "sectorsreservedarea: %d\n", ****b.sectorsreservedarea) ; ****printf ( "copiesFAT: %d\n", ************b.copiesFAT) ; ****printf ( "maxrootdirentries: %d\n", ****b.maxrootdirentries) ; ****printf ( "totalSectors: %d\n", ************b.totalSectors) ; ****printf ( "mediaDescriptor: %d\n", ********b.mediaDescriptor) ; ****printf ( "sectorsperFAT: %d\n", ********b.sectorsperFAT) ; ****printf ( "sectorsperTrack: %d\n", ********b.sectorsperTrack) ; ****printf ( "sides: %d\n", ****************b.sides) ; ****printf ( "hiddenSectors: %d\n", ********b.hiddenSectors) ; ****display_buff(&b); ****for(k = 0; k < 10; k++) ****{**** ********ReadSector ( "\\\\.\\F:", k, 1, &b ); ********display_buff(&b); ****} } void ReadSector ( char *src, int ss, int num, void* buff ) { ****HANDLE h ; ****unsigned int br ; ****h = CreateFile ( src, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0 ) ; ****printf("\nsource name: %s\n", src); ****printf("file handler: %d\n", h); ****SetFilePointer ( h, ( ss * 512 ), NULL, 0 ) ; ****ReadFile ( h, buff, 512 * num, &br, NULL ); ****CloseHandle ( h ) ; } void display_buff(char *buff) { ****ptr = buff; **** ****for(j = 0; (j*16+i) < 512; j++) ****{ ********printf("\n"); ********for(i = 0; i < 16 && (j*16+i) < 512 ; i++)**** ********printf("%.2X ", *ptr++); ********printf(" "); ********ptr -= i; ********for(i = 0; i < 16 && (j*16+i) < 512 ; i++)**** ********if(*ptr >= ' ') ********printf("%c", *ptr++); ********else ********printf(".", *ptr++); ****} }

This is an example code to demonstrate the Disk read write in windows compiled using Dev C++, but it will only work for removable drives in 8.1..

'F:' is the disk name of the removable drive.

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Code C - [expand]
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void ReadSector ( Disk name, sector number, number of sectors, Read Buff address ) ;

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Interested people can have a try on this...