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dumbdrv.txt
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dumbdrv.txt
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DumbDrv
Dummy DOS Device Driver
Copyright (C) 1994-1996 Marcus Better
Version 1.10
January 3, 1996
What is DumbDrv?
================
DumbDrv is a device driver which creates a null block device - a
device that does absolutely nothing, except for occupying one or more
drive letters. This can be useful if one wants to reserve a drive
letter at boot time, so that another driver can use that drive letter.
The KillDrv utility may be used to delete a DumbDrv device.
Here's an example where DumbDrv is useful: Let's say we have a hard
disk called C:, a CD-ROM drive (accessed by MSCDEX.EXE), and a ramdisk
created by RAMDRIVE.SYS. We now want the CD-ROM drive to be D: and
the ramdisk E:. Since RAMDRIVE.SYS is loaded before MSCDEX.EXE, the
ramdisk will automatically become D:, though. This is where DumbDrv
comes in. By loading DUMBDRV.SYS just before RAMDRIVE.SYS, we reserve
the drive letter D:, forcing the ramdisk to become E:. We can then
delete the DumbDrv using the KillDrv utility, and load MSCDEX as D:
instead.
License
=======
DumbDrv is free software, and is distributed under the GNU General
Public License. Please see the file COPYING for details.
Installation
============
DumbDrv is installed by entering the line
DEVICE=d:\path\DUMBDRV.SYS
in your CONFIG.SYS file. The driver will be loaded the next time you
boot your computer. DumbDrv will display a message saying what drive
letters it occupies.
You may also specify the number of drive letters you want to reserve.
To reserve three drives, use the line
DEVICE=d:\path\DUMBDRV.SYS 3
in your CONFIG.SYS. If you do not specify a number, the default value
is 1. If you specify a number higher than the number of available
drive letters, DumbDrv will use all available drives.
NOTE: Drive letters are assigned to block device drivers sequentially
in the order they are loaded in CONFIG.SYS.
Contacting the author
=====================
You are welcome send me any ideas, comments and suggestions for
DumbDrv. If you have found any bugs, please let me know. My email
address is
Marcus.Better@abc.se