drvspace.txt

Dos6.22安装软件,现在使用Dos的朋友不是很多了,希望能大家一些方便.

Using Custom Setup
------------------
Custom Setup gives you more control over the compression process than 
Express Setup does. You should use Custom Setup: 

 *  To compress the data on a hard disk other than drive C. 

 *  If you don't want to compress existing data. 
    
    Compressing existing data can take a long time. If you don't 
    want to compress your existing data, you can have DriveSpace 
    use some of the free space on an existing drive to create a new 
    compressed drive. This method does not compress existing data 
    and is much faster. 

 *  To determine compression settings yourself. 
    
    Depending on whether you are compressing an existing drive 
    or creating a new one, you can specify the drive letter for the 
    new drive, the estimated compression ratio, and the amount 
    of space to leave uncompressed. 


Note  Before you use Custom Setup to compress an existing drive, you should 
      back up the files on that drive. For information about using Microsoft 
      Backup, see the chapter "Managing Your System" in the Microsoft MS-DOS 
      User's Guide.

To install DriveSpace by using Custom Setup 
-------------------------------------------
1. Quit all running programs (including Windows). If you use a network, 
   start the network software and connect to any drives you usually use.

2. Type DRVSPACE at the command prompt. The Welcome screen appears. 

3. To continue DriveSpace, press ENTER. 

DriveSpace displays a screen that prompts you to choose between Express and 
Custom Setup. 

4. Select Custom Setup by pressing the DOWN ARROW key, and then press ENTER. 
   DriveSpace displays a screen in which you can choose between compressing 
   an existing drive and creating a new compressed drive. For information 
   about choosing a compression method, press F1. 

5. Select the compression method you want by pressing the UP ARROW or DOWN 
   ARROW key, and then press ENTER. 

   If your computer has more than one hard disk drive, DriveSpace displays a 
   list of drives. If you chose to compress an existing drive, select the 
   drive you want to compress, and then press ENTER. If you are creating a 
   new compressed drive, select the drive that contains the free space 
   DriveSpace should use to create the new drive, and then press ENTER. 

   DriveSpace displays a screen that shows the default compression settings. 

6. If necessary, change the compression settings to suit your needs. To 
   change a setting, press the UP ARROW or DOWN ARROW key until the setting 
   is highlighted, and then press ENTER to display alternatives. For 
   information about compression settings, press F1. 

7. When all the settings are correct, press ENTER to continue DriveSpace. 
   DriveSpace displays a confirmation screen that estimates the amount of 
   time it will take to compress the drive or free space you selected. 

8. To begin the compression process, press C. 

DriveSpace checks the specified drive for disk errors, and then carries out 
the compression process with the settings you specified. This process can 
take from several minutes to several hours, depending on the speed of your 
hard disk and processor, the amount of data your hard disk contains, and 
whether you chose to compress existing data or create a new compressed 
drive. Because DriveSpace checks and rechecks the validity of the data as 
it compresses existing files, the process is very safe. In fact, if the 
compression process is accidentally interrupted (for example, by a power 
outage), DriveSpace will recover and continue without losing any data. 

During the compression process, DriveSpace Setup restarts your computer 
twice. 

When DriveSpace Setup is complete, it displays a screen that shows how long 
the compression process took and how much space your new drive contains. 
To quit DriveSpace after it has compressed the drive or free space you 
selected, press ENTER. 

After you set up DriveSpace, your computer's drives will be configured 
differently. The results differ depending on whether you chose to compress 
an existing drive or create a new compressed drive. 

If you chose to compress an existing drive
------------------------------------------
If you chose "Compress an existing drive" during Custom Setup: 

 *  The drive you selected will be compressed and will contain more free 
    space than it did before. You will use the compressed drive just as you 
    did before you set up DriveSpace. 

 *  Your computer will have a new drive that is not compressed. This drive 
    is used to store files that must remain uncompressed. For example, the 
    Windows permanent swap file does not work properly when it is compressed; 
    if your Windows permanent swap file was previously located on the drive 
    you compressed, DriveSpace moves it to the new uncompressed drive. 
    
DriveSpace also uses the new uncompressed drive to store important system 
files such as DRVSPACE.000. If you compressed drive C, the new uncompressed 
drive will also contain the IO.SYS, MSDOS.SYS, DRVSPACE.BIN and DRVSPACE.INI 
files. If you try to list the files on this drive, it will probably appear 
empty. This is because most of the files it contains have the Hidden 
attribute; many also have the Read-Only attribute. To view the files, type 
DIR /A at the command prompt. 

CAUTION  Do not tamper with the hidden files on the new drive. If you change 
	 or delete these files, you might lose the files on your compressed 
	 drive. 

If you chose to create a new compressed drive
---------------------------------------------
If you chose "Create a new compressed drive" during Custom Setup: 

 *  Your computer will have a new compressed drive that is currently empty. 
    Although the new drive does use some disk space, it makes up for it by 
    providing more free space than it uses. 

 *  The drive that contained the free space you used to create the new 
    compressed drive will contain less free space than it did before. This 
    space is now being used by your new compressed drive, which is stored 
    in a hidden file with a filename such as DRVSPACE.001. 

For information about adjusting the configuration of your compressed drive, 
see "Using DriveSpace to Manage Compressed Drives" later in this file. For 
information about compressing additional drives, see "Compressing Additional 
Drives" later in this file. For information about compressing floppy disks, 
see "Using DriveSpace with Floppy Disks" later in this file. 


Understanding Disk Compression
==============================
You don't need to know anything about disk compression to run DriveSpace 
Setup: just type DRVSPACE at the command prompt, follow the instructions on 
your screen, and DriveSpace takes care of the rest. 

However, if you want to adjust or modify your DriveSpace configuration, 
you need to understand some disk-compression concepts and terms. This 
section explains the terms you will encounter when you use DriveSpace to 
manage or modify your compressed drives. 


Compressed Volume Files and Host Drives
---------------------------------------
A compressed drive is not a real disk drive, although it appears that way to 
most programs. Instead, a compressed drive exists on your hard disk as a 
compressed volume file (CVF). 

A CVF is a file with Read-Only, Hidden, and System attributes that contains 
a compressed drive. Each CVF is located on an uncompressed drive, which is 
referred to as the CVF's host drive. A CVF is stored in the root directory 
of its host drive and has a filename such as DRVSPACE.000. 

Most CVFs can store more data than the space they use on their host drives; 
for example, a typical CVF might use 10 MB of space on its host drive but 
contain 20 MB of compressed data. DriveSpace assigns a drive letter to the 
CVF so that you can use it as a disk drive and can access the files it 
contains. 

CAUTION  Do not tamper with a CVF. If you do, you might lose all the files 
	 on your compressed drive. 


How DriveSpace Calculates Free Space on a Compressed Drive
----------------------------------------------------------
On an uncompressed drive, free space indicates how much additional data you 
can store on that drive. For example, if a drive has 2 megabytes (MB) of 
free space, you can expect to fit 2 MB of data on it. However, the free 
space on a compressed drive is only an estimate of how much data you can fit 
on that drive. 

When you store a file on a compressed drive, DriveSpace compresses the file 
so that it takes up as little space as possible. Some files can be compressed 
more tightly than others; for example, a bitmap file can be compressed much 
more than a program file. DriveSpace cannot detect the compressibility of 
files you haven't stored yet, so it can only estimate a compressed drive's 
free space. 

DriveSpace estimates a drive's free space by using the estimated compression 
ratio, which you can set to specify the compressibility of the files you plan 
to store. For example, if the estimated compression ratio is set to 3 to 1, 
DriveSpace calculates the drive's free space based on the assumption that 
the files you will store will be compressible at a 3-to-1 ratio