Availability of bios.h on the net

Posted on 2001-06-03
Last Modified: 2007-11-27
Hello. I need urgently to find a location from where i can download bios.h and vwin32.h. This is to be able to use _bios_disk to format a disk so that it is unreadable in dos.I want to format a disk somehow in win98 so that it is unreadble in DOS.
if somebody can give me any code to do this (in vc or assembly) i would be very grateful.
ps: I want to program this in vc++. I have already found out DeviceIoControl and _bios_disk but these require the bios.h . Thanks.
ps: Thanks sunbow, can u please suggest the code for this at
Question by:snb2001
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LVL 49

Expert Comment

ID: 6151687
Surely that file comes with vc++ ?

It comes with Borland's Turbo C.

Expert Comment

ID: 6153238
Yeah..I agree with dbrunton
Also it comes with Watcom C/C++ (bios.h)

You may get source code at(may not useful to you):

(bios.h) ==>

(vwin32.h) ==>

I'll suggest to download Borland C++ Builder (command line tools)from

LVL 24

Expert Comment

ID: 6153335
ditto....  (btw: M$.Win does 'like' to permit user to access low level)
On Web, try CodeGuru, ex.:

> "so that it is unreadable in dos"
Probably all you need do is address the placement of code instructions in the first sectors with your own code. Of course, do not make it bootable. Just remember, if you can write code to access differently, so can someone else, AND, many programs will either treat as virus or bad disk, adding confusion to whoever needs to run it.
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LVL 24

Expert Comment

ID: 6153344
(oops, s/b:) ..btw: M$.Win does NOT 'like' to permit user to access low level code

Expert Comment

ID: 6153507
I'll check it @my home PC.

Expert Comment

ID: 6153508
I'll check those files @my home PC.
LVL 24

Expert Comment

ID: 6160464
Here's some descriptors to beware of:

Another thought, depending on needs, many people simply get the hard drive (space/cheap) and linux, which is theoretically free code/OS.

Linux gives you formatting utilities, that are compatibly incompatible with dos/win. What I mean is that the format can end up recognizable to MSDOS in a way that it will more often reject any user attempt to write to disk, claiming there is something there, dunno what, some unknown OS, etc. So it (1) will not read, (2) will not write, (3) preserve your work, (4) be readable in an alternative shareable format.

Linux, btw, has capability to write back to dos diskette or fat16 HD, usually (depends on who's version you get), with commands very similar to dos, like dir and copy. Thus when in linux environment, you can move real dos files off the dos part of the machine, or back to dos machine again, without having to do any low-level programming. When in the linux formatted part, Dos will not read, but it'll know something is there so you can better avoid uninformed deletions.

For exercising an assembler to use bios, try on interrupt 13:
Function 05 format cylinder
Function 09 Adapt to foreign drives

Note, Windows environment does not want to permit you to access/run low-level I/O. It wants to maintain readability.

For protecting data, consider encrypting files, then decrypting. A good ZIP package may do that efficiently enough for your purpose.
LVL 24

Expert Comment

ID: 6161115
With the time, to go on the cheap:
LVL 24

Expert Comment

ID: 6161135
Go here for 90% of the assembler code:
Note: you need not read disk, but should initialize buffer to zero
LVL 54

Expert Comment

ID: 7466758

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
 - PAQ'd and pts removed
Please leave any comments here within the
next seven days.



Accepted Solution

modulo earned 0 total points
ID: 7506198
Finalized as proposed


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