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From: tcs@mailer.jhuapl.edu (Carl Schelin)
Newsgroups: comp.os.msdos.programmer
Subject: Re: How to detect network drive?
Message-ID: <1991Apr9.111047.24054@aplcen.apl.jhu.edu>
Date: 9 Apr 91 11:10:47 GMT
References: <1991Apr6.231902.5436@newross.Princeton.EDU>
Sender: news@aplcen.apl.jhu.edu (USENET News System)
Organization: Johns Hopkins University - Applied Physics Lab
Lines: 40

In article <1991Apr6.231902.5436@newross.Princeton.EDU>, tr@samadams.princeton.edu (Tom Reingold) says:
>
>
>I know how to read the boot sector of a disk.  If the first byte is
>0xf8, it's supposed to be a hard disk.  But my networked disks (AT&T
>Stargroup) have the same ID.  How do I detect if a disk is a network
>disk?
>--

This was information taken from a few previous messages. Someone 
posted a routine from a program (called getpath I think) and someone
else mentioned int 44. Since I couldn't get the int86 function to work
nor could I get the getpath function to work, I combined them and
called int 44 from the GetDiskInfo routine. The #define'd statements 
are just the codes for ?, n, <space>, and s. 

This routine is from Free v1.3 which is coming on c.b.i.p in the next
week or two.

int GetDiskInfo(int drive)
{
        union REGS r;
        struct SREGS s;
        int remote = 0;

        r.x.ax = 0x4409;
        r.x.bx = 0x0000 + drive;
        /* assuming near pointers: */
        segread(&s);
        s.es = s.ds;
        intdosx(&r,&r,&s);
        remote = UNKNOWN;
        if (r.x.dx == 0x1756) remote = NETWORK;
        if (r.x.dx == 0x0840) remote = LOCAL;
        if (r.x.dx == 0x8840) remote = SUBST;
        return remote;
}

Carl Schelin
tcs@mailer.jhuapl.edu