MS-DOS v6.22 Help: DRVSPACE.SYS

--------------------- MS-DOS v6.22 Help: DRVSPACE.SYS ----------------------
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                                DRVSPACE.SYS

Determines the final memory location of DRVSPACE.BIN, the part of MS-DOS
that provides access to your compressed drives.

When you start your computer, MS-DOS loads DRVSPACE.BIN along with other
operating system functions, before carrying out the commands in your
CONFIG.SYS and AUTOEXEC.BAT files. DRVSPACE.BIN initially loads in
conventional memory because it loads before device drivers that provide
access to upper memory.

When you run DriveSpace Setup, it adds a command for DRVSPACE.SYS to your
CONFIG.SYS file.

Syntax

    DEVICE = [drive:][path]DRVSPACE.SYS /MOVE [/NOHMA]

    DEVICEHIGH = [drive:][path]DRVSPACE.SYS /MOVE [/NOHMA]

Switches

/MOVE
    Moves DRVSPACE.BIN to its final location in memory.

    Initially, DRVSPACE.BIN loads at the top of conventional memory. After
    MS-DOS finishes carrying out the commands in the CONFIG.SYS file, it
    moves DRVSPACE.BIN to the bottom of conventional memory. When
    DRVSPACE.SYS is loaded by using the DEVICE command, it moves
    DRVSPACE.BIN from the top of conventional memory to the bottom. This can
    be useful for avoiding conflicts with programs that are loaded from the
    CONFIG.SYS file and require access to the top of conventional memory.

    When DRVSPACE.SYS is loaded by using the DEVICEHIGH command,
    DRVSPACE.BIN moves to upper memory, if available. Moving DRVSPACE.BIN to
    upper memory makes more conventional memory available.

/NOHMA
    Prevents DRVSPACE.SYS from moving a portion of DRVSPACE.BIN to the high
    memory area (HMA).

    If MS-DOS is loaded into the HMA, DRVSPACE.SYS moves a  portion of
    DRVSPACE.BIN to the HMA (if there is enough room in the HMA). Use this
    switch if you do not want DRVSPACE.BIN to use the HMA. (It is not
    necessary to use this switch if you upgraded to MS-DOS 6.22 from MS-DOS
    6.0.)

Parameter

[drive:][path]
    Specifies the location of the DRVSPACE.SYS file.

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<Syntax> <Examples>
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                           DRVSPACE.SYS -- Notes

DRVSPACE.SYS does not provide access to compressed drives

The DRVSPACE.SYS device driver does not provide access to compressed drives;
it simply moves DRVSPACE.BIN to its final location in memory. (DRVSPACE.BIN
is the part of MS-DOS that provides access to compressed drives; it loads
with other operating system functions, before MS-DOS carries out the
commands in your CONFIG.SYS file.)

If your compressed drive's host drive requires a device driver

A few disk drives require an installable device driver. If such a drive
contains compressed volume files (either you compressed that drive, or you
created new compressed drives on that drive), the command for the
DRVSPACE.SYS device driver must appear in the CONFIG.SYS file after the
command for your drive's device driver. Otherwise, DriveSpace will not mount
any compressed volume files located on that drive when your computer
starts.

Avoiding conflicts with programs that require access to the top of
conventional memory

When you start your computer, MS-DOS loads DRVSPACE.BIN at the top of
conventional memory; after processing the CONFIG.SYS file, MS-DOS moves
DRVSPACE.BIN to the bottom of conventional memory.

However, a few programs that are loaded from the CONFIG.SYS file require
access to the top of conventional memory and do not work properly if
DRVSPACE.BIN is located there. To avoid such conflicts, DriveSpace Setup
adds a command for DRVSPACE.SYS before any command that starts a program
that is known to require this area of memory. The DRVSPACE.SYS device driver
moves DRVSPACE.BIN from the top of conventional memory to another area of
memory (either to the bottom of conventional memory or to upper memory).

Depending on your configuration, your CONFIG.SYS file might contain more
than one command for DRVSPACE.SYS. This will not cause any problems.

Moving part of DRVSPACE.BIN to the high memory area

By default, if your CONFIG.SYS file contains a DOS=HIGH command,
DRVSPACE.SYS moves the compression server, a portion of DRVSPACE.BIN, to the
HMA. To move a portion of DRVSPACE.BIN to the HMA, you must have an 80286 or
higher computer with extended memory, and must be running HIMEM or another
extended-memory manager.

Moving DRVSPACE.BIN to upper memory

When loaded with a DEVICEHIGH command, the DRVSPACE.SYS device driver moves
DRVSPACE.BIN from conventional to upper memory. If there is no upper memory
block large enough to accommodate DRVSPACE.BIN, it is instead moved to the
bottom of conventional memory.

To use the upper memory area, you must have an 80386 or 80486 computer with
extended memory.

Using BUFFERS with DriveSpace

If you are using DriveSpace and SMARTDrive, and MS-DOS is loaded into the
HMA, set BUFFERS=10. This ensures that there will be enough room in the HMA
for MS-DOS, DriveSpace, and all your buffers. (If BUFFERS is set to a value
higher than 10, there might not be enough room in the HMA for all your
buffers, and MS-DOS will place all the buffers into conventional memory.) If
you're using SMARTDrive, specifying more than 10 buffers will not speed up
your system much, but will use additional memory.

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                          DRVSPACE.SYS -- Examples

To move a portion of DRVSPACE.BIN to the HMA and move the rest to the bottom
of conventional memory, you must have an 80286 or higher computer, and your
CONFIG.SYS file must contain a DOS=HIGH command and a DEVICE command for
HIMEM or another extended-memory manager. Load DRVSPACE.SYS by using the
following command:

    device=drvspace.sys /move

To move a portion of DRVSPACE.BIN to the HMA and the rest to the upper
memory area (if available), you must have an 80386 or higher computer with
extended memory. Ensure that your CONFIG.SYS file contains a DEVICE command
for DRVSPACE.SYS, and then run MemMaker.

To move all of DRVSPACE.BIN to the bottom of conventional memory, and to
prevent DRVSPACE.BIN from using the HMA or upper memory, load DRVSPACE.SYS
by using the following command:

    device=drvspace.sys /move /nohma

To move all of DRVSPACE.BIN to upper memory (if available), and to prevent
DRVSPACE.BIN from using the HMA, load DRVSPACE.SYS by using the following
command:

    devicehigh=drvspace.sys /move /nohma

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