skanade
asked on
Code to make bad sector
I found the following code for a DOS program that marks a sector bad on a floppy.
Questions:
1) It only works first time. Later, one has to reboot the system for a second floppy. Why?
2) Can there be an equivalent Windows code from win32? I don't mind if it only works on Win9X.
#include <stdio.h>
#include <bios.h>
#include <dos.h>
#include <conio.h>
int main (void)
{
char buffer[512];
int x;
for (x = 0; x < 18; x++)
{
buffer[x * 4 + 0] = 40;
buffer[x * 4 + 1] = 0;
buffer[x * 4 + 2] = x + 1;
buffer[x * 4 + 3] = 2;
}
buffer[0] = 0xFF;
buffer[1] = 0xFF;
buffer[2] = 0xFF;
buffer[3] = 0xFF;
buffer[4] = 0xFF;
buffer[5] = 0xFF;
buffer[6] = 0xFF;
buffer[7] = 0xFF;
printf ("Insert a formatted disk. Press a key to continue...");
getch();
printf ("\n");
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
if (biosdisk (_DISK_FORMAT, 0, 0, 40, 1, 1, buffer) != 0)
printf ("Format error.\n");
printf ("Remove the disk, and re-insert it. Press a key to continue...");
getch();
printf ("\n");
if (absread (0, 1, 1440, buffer) == -1)
printf ("OK. Sector is bad.\n");
else
printf ("Sorry... the Sector was read.\n");
return 0;
}
Questions:
1) It only works first time. Later, one has to reboot the system for a second floppy. Why?
2) Can there be an equivalent Windows code from win32? I don't mind if it only works on Win9X.
#include <stdio.h>
#include <bios.h>
#include <dos.h>
#include <conio.h>
int main (void)
{
char buffer[512];
int x;
for (x = 0; x < 18; x++)
{
buffer[x * 4 + 0] = 40;
buffer[x * 4 + 1] = 0;
buffer[x * 4 + 2] = x + 1;
buffer[x * 4 + 3] = 2;
}
buffer[0] = 0xFF;
buffer[1] = 0xFF;
buffer[2] = 0xFF;
buffer[3] = 0xFF;
buffer[4] = 0xFF;
buffer[5] = 0xFF;
buffer[6] = 0xFF;
buffer[7] = 0xFF;
printf ("Insert a formatted disk. Press a key to continue...");
getch();
printf ("\n");
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
biosdisk (_DISK_RESET, 0, 0, 41, 1, 1, NULL);
if (biosdisk (_DISK_FORMAT, 0, 0, 40, 1, 1, buffer) != 0)
printf ("Format error.\n");
printf ("Remove the disk, and re-insert it. Press a key to continue...");
getch();
printf ("\n");
if (absread (0, 1, 1440, buffer) == -1)
printf ("OK. Sector is bad.\n");
else
printf ("Sorry... the Sector was read.\n");
return 0;
}
BeyondWu
listening..
Make it more clear:
One can read/write a floppy sectors from Win32,
but to change a sector size can be done only from DOS.
It is usually done only for copy protection.
It is also possible to hide your code in this sector
of different size and inject it into your program.
One can read/write a floppy sectors from Win32,
but to change a sector size can be done only from DOS.
It is usually done only for copy protection.
It is also possible to hide your code in this sector
of different size and inject it into your program.
ASKER
I want to use it for copy protection only. Can you
see why a reboot is required for marking the next
floppy? Thanks.
see why a reboot is required for marking the next
floppy? Thanks.
ASKER CERTIFIED SOLUTION
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1. Accept a Comment As Answer (use the button next to the Expert's name).
2. Close the question if the information was not useful to you. You must tell the participants why you wish to do this, and allow for Expert response.
3. Ask Community Support to help split points between participating experts, or just comment here with details and we'll respond with the process.
4. Delete the question. Again, please comment to advise the other participants why you wish to do this.
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PLEASE DO NOT AWARD THE POINTS TO ME.
------------> EXPERTS: Please leave any comments regarding your closing recommendations if this item remains inactive another seven (7) days. Also, if you are interested in the cleanup effort, please click this link https://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=commspt&qid=20274643
Thank you everyone.
Moondancer
Moderator @ Experts Exchange
No more discusion, no more comment,
nothing to say.
forge
nothing to say.
forge
ASKER
"3. Ask Community Support to help split points between participating experts, or just comment here with
details and we'll respond with the process."
I would prefer to do that.
Thanks,
Sanjay
details and we'll respond with the process."
I would prefer to do that.
Thanks,
Sanjay
What ever you do I'm happy.
Thanks
forge
Thanks
forge
Thank you, I have finalized this for you. This is being awarded to the one Expert who provided you the guidance, the other expert was only "listening".
Item completed.
Moondancer - EE Moderator
Item completed.
Moondancer - EE Moderator