Re: How can I read the MBR (Master Boot Record) under OS/2?

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#1278

From: "Kenneth A. Kahn"
Date: Fri, 28 Aug 1992 21:49

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Organization: Staff of IBM Fellow - NetWork Computing
Disclaimer: This posting represents the poster's views, not those of IBM
News-Software: UReply 3.0
X-X-From: KENKAHN@PKSMRVM.VNET.IBM.COM (Ken Kahn)
References: <N2c9PB2w165w@tsoft.sf-bay.org>

In <N2c9PB2w165w@tsoft.sf-bay.org> Dennis Yelle writes:
>
>I am trying to read the Master Boot Record from my C: drive
>under OS/2.
>

I'm not familar with the IOCtl Inetrface for doing this, but the same effect
can be accomplished with the following code:

  HFILE  BR_Handle;
  USHORT BR_Action;

  RC = DosOpen("C:",&BR_Handle,&BR_Action,0L,FILE_DIRECTORY,
               OPEN_ACTION_OPEN_IF_EXISTS,
               OPEN_ACCESS_READWRITE+OPEN_SHARE_DENYNONE+OPEN_FLAGS_DASD,
               ,0L);

The important part here is the OPEN_FLAGS_DASD.  This tells OS/2 that this
is a request to open a Drive rather than a file.  You can then use the handle
(BR_Handle) with DosRead and DosWrite to manipulate the Drive; i.e. the first
256 Bytes are the Boot Record.

Technical Details

Message-ID: <9208282200.AA22808@ucbvax.Berkeley.EDU>

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From: KENKAHN@PKSMRVM.VNET.IBM.COM ("Kenneth A. Kahn")
Newsgroups: comp.os.os2.programmer
Subject: Re: How can I read the MBR (Master Boot Record) under OS/2?
Message-ID: <9208282200.AA22808@ucbvax.Berkeley.EDU>
Date: 28 Aug 92 21:49:51 GMT
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