Dosemu: HDD-Zugriff

Dosemu: HDD-Zugriff

[aza]

hi!

Ich habe auf meinem Rechner Windows XP.
Darauf läuft über VMware ein Linux Betriebssystem, welches sich eine eigene
kleinere Festplatte simuliert.
Auf Linux läuft der Dos-Emulator (dosemu 1.0.2) der sich ebenfalls wieder
eine eigene C-Platte simmuliert. Diese ist nur noch 2GB von ursprünglich 56GB
in Windows.

Ich muss aber über den DOS-Emulator auf die gesammte Festplatte (56GB)
zugreifen können!

Könnten sie mir vielleicht bei diesem Problem behilflich sein?
(dies ist nämlich ein Teil eines Projektes und muss bald fertig sein)

Vielen Dank!
Toni

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Dosemu: HDD-Zugriff

[Reinhard Karcher]

On Fri, Jul 05, 2002 at 02:03:05PM +0200, aza@gmx.at wrote
> Auf Linux läuft der Dos-Emulator (dosemu 1.0.2) der sich ebenfalls wieder
> eine eigene C-Platte simmuliert. Diese ist nur noch 2GB von ursprünglich 56GB
> in Windows.
> 
> Ich muss aber über den DOS-Emulator auf die gesammte Festplatte (56GB)
> zugreifen können!
> 

(Toni wants access to a 56G Partion.)

AFAIK is DOS limited to 2G partitions.

Reinhard

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Re: Dosemu: HDD-Zugriff

[Uwe Bonnes]

>>>>> "Reinhard" == Reinhard Karcher <rkarcher@frey.de> writes:

    Reinhard> On Fri, Jul 05, 2002 at 02:03:05PM +0200, aza@gmx.at wrote
    >> Auf Linux läuft der Dos-Emulator (dosemu 1.0.2) der sich ebenfalls
    >> wieder eine eigene C-Platte simmuliert. Diese ist nur noch 2GB von
    >> ursprünglich 56GB in Windows.
    >> 
    >> Ich muss aber über den DOS-Emulator auf die gesammte Festplatte
    >> (56GB) zugreifen können!
    >> 

    Reinhard> (Toni wants access to a 56G Partion.)

    Reinhard> AFAIK is DOS limited to 2G partitions.

Aren't there BIOS Calls to support big disks?

Bye
-- 
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

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Re: Dosemu: HDD-Zugriff

[Reinhard Karcher]

On Fri, Jul 05, 2002 at 02:47:22PM +0200, Uwe Bonnes wrote
>     Reinhard> (Toni wants access to a 56G Partion.)
> 
>     Reinhard> AFAIK is DOS limited to 2G partitions.
> 
> Aren't there BIOS Calls to support big disks?
> 

You can't use BIOS Calls to MFS-Directories. You can't give the whole
partition to DOS without dismountig it from linux. You can't do
concurrent access from linux and dosemu BIOS Calls to the same partition
without data corruption.

Perhaps the MFS Redirector can access more than 2G?
Even if it  can, many DOS Programs can't cope with more than 2G data on
one partitionen.

Reinhard

Re: Dosemu: HDD-Zugriff

[Bart Oldeman]

On Fri, 5 Jul 2002, Reinhard Karcher wrote:

> > Aren't there BIOS Calls to support big disks?
> > 

Yes, and they are in DOSEMU too, but ...

> You can't use BIOS Calls to MFS-Directories. You can't give the whole
> partition to DOS without dismountig it from linux. You can't do
> concurrent access from linux and dosemu BIOS Calls to the same partition
> without data corruption.

indeed. But we don't know what the original poster did exactly.
 
> Perhaps the MFS Redirector can access more than 2G?
> Even if it  can, many DOS Programs can't cope with more than 2G data on
> one partitionen.

That's true. The maximum that the MFS (int2f/110c) reports is now:
32 sectors/cluster
1024 bytes/sector
65535 total clusters
65535 free clusters

so 2G max. A similar limit exists for int21/ah=36, and although you can
stretch that many DOS programs would be confused if you would do that.

The only way to get around that problem is to find a way to communicate
between the MFS and int21/ax=7303. That is certainly possible for
FreeDOS, but I'm not sure about Win98 DOS. Only a few DOS programs know
about that function.

Bart

Re: Dosemu: HDD-Zugriff

[Oliver Ob]

Reinhard Karcher schrieb:
> You can't use BIOS Calls to MFS-Directories. You can't give the whole
> partition to DOS without dismountig it from linux. You can't do
> concurrent access from linux and dosemu BIOS Calls to the same partition
> without data corruption.
THIS hass been possible up to version 0.67 or 0.97
I know that because I have done exactly THAT redirection for
my bbs. Read my "Need your advice" thread on this.

> Perhaps the MFS Redirector can access more than 2G?
DOS generally cannot access partitions larger than 2GB
But that depends on the VERSION of DOS you are using.

> Even if it  can, many DOS Programs can't cope with more than 2G data on
> one partitionen.
Again, this - so I was told - depends on what DOS you use.
Maybe FreeDOS can.
 

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