Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

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

Status
Not open for further replies.

Venkadesh_M

Advanced Member level 4
Joined
Jun 26, 2013
Messages
1,375
Helped
258
Reputation
516
Reaction score
254
Trophy points
83
Location
Coimbatore, India
Activity points
6,738
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

Advanced Member level 4
Joined
Jun 26, 2013
Messages
1,375
Helped
258
Reputation
516
Reaction score
254
Trophy points
83
Location
Coimbatore, India
Activity points
6,738
I got a way to do that,
Code C - [expand]

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
#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.


Code C - [expand]
1
void ReadSector ( Disk name, sector number, number of sectors, Read Buff address ) ;



Interested people can have a try on this...
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top