drvspace.hlp

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.

         technician. Do not compress or uncompress the drive until it has
         been inspected by a technician.





@@!HL84!@
 Help -- Compressed Volume File

A compressed drive is not a real disk drive, although it appears that way to most programs. Instead, a compressed drive exists on your disk as a hidden file called a compressed volume file (CVF). A compressed volume file is stored in the disk's root directory and has a filename in the form %S.nnn. When you compress the files on an existing drive, %N names the associated compressed volume file %S.000. When you create a new compressed drive, %N names the associated CVF by using a number such as 001 (for example, %S.001). 

Most CVFs can store more data than the space they use; for example, a typical CVF might use 10 MB of space on its host drive but contain 20 MB of compressed data. When a CVF is mounted, or made active, it is assigned a drive letter and appears as a disk drive. The CVF's contents are then accessible and appear as normal files.

Related Topic
-------------
  "Mounting a Compressed Volume File"~HL95~

@@!HL92!@
 Help -- Host Drive

A host drive is an uncompressed drive that contains one or more compressed volume files. Sometimes the host drive is referred to as the "physical drive" because it is an actual hard-disk partition or floppy disk.

After a drive is compressed, it becomes the host drive for a compressed volume file. The CVF contains the files that used to be on the host drive. Usually, the host drive contains very little free space after compression, since the compressed volume file uses so much space. Because it is compressed, a CVF can store more data than the space it uses; for example, a typical CVF might use 10 MB of space on the host drive but contain 20 MB of compressed data. 

@@!HL87!@
 Help -- Estimated Compression Ratio

The estimated compression ratio is a number that %N uses to calculate the amount of free space on a compressed drive. 

On an uncompressed drive, the free space indicates how much additional data you can store. However, on a compressed drive, the amount of data you can store depends on how compressible the files are. %N estimates a drive's free space by assuming that you will store files that can be compressed to the estimated compression ratio.

You might want to change this ratio if it differs greatly from the actual compressibility of the files you plan to store. For example, you might want to specify a higher estimated compression ratio if you plan to store extremely compressible files such as bitmap files. You might want to specify a lower ratio if you will store files that will not compress much further, such as certain program (.EXE or .COM) files.

Note: Changing a drive's estimated compression ratio does not 
      affect how much %N actually compresses the files 
      on that drive; it changes only the way %N estimates 
      the free space on the compressed drive.

Having the wrong estimated compression ratio for your files can cause %N to provide inaccurate space estimates to MS-DOS, which can, in turn, result in problems when storing files. If the ratio is too high, %N overestimates the amount of free space; the DIR command might then report that more space is free than is actually available. If the ratio is too low, MS-DOS might be unable to copy a file even though there may be plenty of space for that file.

Note: To find out the actual compression ratio of your existing 
      files, type the DIR /C command at the MS-DOS command prompt.
      For more information, type HELP DIR at the command prompt.

Related Topic
-------------
  "Changing the Compression Ratio of a Drive"~HL77~

@@!HL76!@
 Help -- Working with Existing Compressed Drives

The main %N screen lists all the compressed drives that are currently mounted. 

To work with a compressed drive, first select it from the list by clicking it with the mouse, or by pressing the UP ARROW or DOWN ARROW keys until the drive is highlighted. Then choose the command you want to carry out from the Drive or Tools menu.

If there are more drives than fit in the window, you can scroll through the list by using the scroll bar on the right side of the list or by pressing the DOWN ARROW, UP ARROW, PAGE DOWN or PAGE UP keys.

You can carry out the following actions on a compressed drive you have selected:

  "Display information about a drive"~HL91~
  "Change the size of a drive"~HL78~
  "Change the compression ratio of a drive"~HL77~
  "Unmount a drive"~HL98~
  "Format a drive"~HL90~
  "Delete a drive"~HL86~
  "Defragment a drive"~HL85~
  "Uncompress a drive"~HLAA~

You can also do the following:

  "Mount an unmounted compressed drive"~HL95~
  "Compress an existing drive"~HL80~
  "Create a new compressed drive"~HL83~

@@!HL89!@
 Help -- Using Floppy Disks

You can use %N to increase the storage capacity of floppy disks as well as hard disks. To compress a floppy disk, choose the Existing Drive command from the Compress menu. 

In general, %N treats compressed floppy disks just like compressed hard disks. However, there are a few differences:

  * You cannot create a new empty compressed drive on a floppy 
    disk. (That is, you cannot compress a floppy disk by using
    the Create New Drive... command.)

  * Normally, %N automatically mounts a compressed 
    floppy disk when you try to use that disk. However, if
    you turn off the Enable Automounting option in the Options 
    dialog, you must mount compressed floppy disks yourselfr.
  
Related Topics
--------------
  "Compressing an Existing Drive"~HL80~
  "Mounting an Unmounted Compressed Drive"~HL95~

@@!HL91!1!@
 Help -- Displaying Information About a Drive

You can display information about a compressed drive by using any of the following methods:

 * Select the drive in the main %N screen, and then press
   ENTER or choose the Info command from the Drive menu.

 * Double-click the drive in the main %N screen.

 * From the MS-DOS command prompt, type the %S /INFO command.
   For more information, type HELP %S /INFO at the command 
   prompt.

%N provides the following information about the selected compressed drive:

 * Its volume label
 * The time and date it was created
 * Its total capacity
 * The amount of data stored on it
 * An estimate of the amount of free space it contains
 * Its actual compression ratio
 * Its "estimated compression ratio"~HL87~
 * The name of its "compressed volume file"~HL84~
 * The size of its compressed volume file

@@!HL78!2!@
 Help -- Changing the Size of a Drive

You can change the size of a compressed drive. 

You might want to enlarge a compressed drive if it is getting full. You can enlarge the compressed drive only if the host drive contains some free space. Enlarging a compressed drive makes more free space on it, but removes free space from the host drive. 

You might want to reduce the size of a compressed drive if you need more free space on the host drive. You can reduce the size of a compressed drive only if it contains free space. 

To change the size of a compressed drive, select it in the main %N screen, and then choose the Change Size command from the Drive menu.

You can also change the size of a compressed drive from the MS-DOS command prompt by using the %S /SIZE command. For more information, type HELP %S /SIZE at the command prompt.

@@!HL77!3!@
 Help -- Changing the Compression Ratio of a Drive

The "estimated compression ratio"~HL87~ is a number that %N uses to calculate the amount of free space on a compressed drive. 

You might want to change a drive's estimated compression ratio if it differs greatly from the actual compressibility of the files you plan to store on that drive.

Note: Changing a drive's estimated compression ratio does not 
      affect how much %N actually compresses the 
      files on that drive; it changes only the way %N 
      estimates the free space on the compressed drive.

To change a drive's estimated compression ratio, select the drive in the main %N screen, and then choose the Change Ratio command from the Drive menu.

You can also change a drive's estimated compression ratio from the MS-DOS command prompt by using the %S /RATIO command. For more information, type HELP %S /RATIO at the command prompt.

@@!HL98!5!@
 Help -- Unmounting a Compressed Drive

You can instruct %N to unmount a compressed drive. Unmounting a compressed drive makes the files on it temporarily unavailable. To make the files available again, remount the drive by choosing the Mount command from the Drive menu.

An unmounted drive resides in the root directory of your disk as a "compressed volume file"~HL84~ -- a hidden file with a filename in the form %S.nnn (for example, %S.001).

To unmount a compressed drive, select it in the main %N screen, and then choose the Unmount command from the Drive menu.

You can also unmount a drive from the MS-DOS command prompt by using the %S /UNMOUNT command. For more information, type HELP %S /UNMOUNT at the command prompt.

Note: %N automatically remounts a compressed floppy 
      disk as soon as you try to use the disk -- even if you 
      have unmounted it. However, if you turn off the Enable 
      Automounting option in the Options dialog, you must mount
      compressed floppy disks yourself.

Related Topic
-------------
  "Mounting an Unmounted Compressed Drive"~HL95~

@@!HL90!6!@
 HELP --  Formatting a Compressed Drive

You can instruct %N to format a compressed drive. You might want to format a compressed drive if you have already backed up all the files on that drive and want to make the drive completely empty.

CAUTION: If you format a compressed drive, all the files it 
         contains will be permanently erased. Formatting a 
         compressed drive erases its contents and leaves the 
         empty compressed volume file on your disk.

To format a compressed drive, select it in the main %N screen, and then choose the Format command from the Drive menu.

You can also format a compressed drive from the MS-DOS command prompt by using the %S /FORMAT command. For more information, type HELP %S /FORMAT at the command prompt.

@@!HL86!7!@
 HELP --  Deleting a Compressed Drive

You can instruct %N to permanently delete a compressed drive and its associated compressed volume file. You might want to delete a compressed drive if you have already backed up all the files on that drive and want to reclaim the space used by the compressed volume file on the host drive.

CAUTION: When you delete a drive, you also delete all the files 
         it contains. Deleting a compressed drive removes the 
         compressed volume file from your disk.

To delete a compressed drive, select it in the main %N screen, and then choose the Delete command from the Drive menu.

You can also delete a compressed drive from the MS-DOS command prompt by using the %S /DELETE command. For more information, type HELP %S /DELETE at the command prompt.

@@!HL88!8!@
 HELP --  Quitting %N

To quit the %N program, choose the Exit command from the Drive menu. 

Note: If you mounted any compressed floppy disks or removable-media 
      drives, they will remain mounted until you unmount them or 
      restart your computer.

@@!HL85!11!@
 HELP --  Defragmenting a Compressed Drive

You can instruct %N to defragment a compressed drive. Defragmenting a compressed drive moves all the data to the beginning of the compressed volume file and all the free space to the end. Unlike defragmenting an uncompressed drive, it does not reorganize the files on the drive so that they are stored contiguously. Defragmenting a compressed drive has no effect on its speed. 

You should defragment a compressed drive before you reduce its size. If you do, you might be able to reduce the drive's size more than you otherwise could.

To defragment a compressed drive, select it in the main %N screen, and then choose the Defragment command from the Drive menu.

You can also defragment a compressed drive from the MS-DOS command prompt by using the %S /DEFRAG command. For more information, type HELP %S /DEFRAG at the command prompt.


@@!HL93!@
 HELP --  Listing Your Computer's Drives

You can have %N display a list of your computer's drives. 
To do this, quit %N and type the %S /LIST command at the MS-DOS command prompt.

%N lists your computer's hard disk drives, RAM drives, floppy-disk drives and other removable-media drives. (It does not list network drives.) %N shows the following information about each drive:

 * Its drive letter.
 * The kind of drive it is, and whether or not it is compressed. 
   (%N uses the term "removable-media drives" to refer to 
   floppy-disk drives as well as other types of removable-media 
   drives.)
 * Its total capacity.
 * The amount of free space it contains.
 * The name of its compressed volume file, if it is a compressed 
   drive.

For more information about the %S /LIST command, type HELP %S /LIST at the command prompt.

@@!HL95!4!@
 HELP --  Mounting a Compressed Drive

A compressed drive is actually just a compressed volume file until you mount it. Mounting a compressed volume file establishes a connection between it and a drive letter, so that you can use that CVF as a drive.

%N automatically mounts your compressed hard drives when you start your computer. It automatically mounts compressed floppy disks and other removable media as soon as you try to use them. (If the Enable Automounting option in the Options dialog is turned off, then %N does not automatically mount removable media.)

To mount a compressed volume file, choose the Mount command from the Drive menu, and then select the compressed volume file from the list that %N displays.

You can also mount a compressed volume file from the MS-DOS command prompt by using the %S /MOUNT command. For more information, type HELP %S /MOUNT at the command prompt.

Related Topics
--------------
  "Unmounting a Compressed Drive"~HL98~
  "Working with Floppy Disks"~HL89~

@@!HL80!9!@
 HELP --  Compressing an Existing Drive

When you compress an existing drive, you compress all the files on it. When compression is complete, your original drive will contain compressed files and additional free space. You will also have a new uncompressed drive that contains any uncompressible files from the drive you just compressed.

To compress an existing drive, choose the Existing Drive option from the Compress menu. 

You can also compress an existing drive from the MS-DOS command prompt  by using the %S /COMPRESS command. For more information, type HELP %S /COMPRESS at the command prompt.

Related Topics
--------------
  "Creating a New Compressed Drive"~HL83~
  "Working with Floppy Disks"~HL89~

@@!HL83!10!@
 HELP --  Creating a New Compressed Drive

You can create a new compressed drive by using free space on an existing uncompressed drive. When compression is complete, you will have a new compressed drive that contains more free space than it took from the existing drive.

To create a new compressed drive, choose the Create New Drive option from the Compress menu.

You can also create a new compressed drive from the MS-DOS command prompt by using the %S /CREATE command. For more information, type HELP %S /CREATE at the command prompt.

Related Topic
-------------
  "Compressing an Existing Drive"~HL80~

@@!HL83!10!@
 HELP --  Creating a New Compressed Drive

You can create a new compressed drive by using free space on an existing uncompressed drive. When compression is complete, you will have a new compressed drive that contains more free space than it took from the existing drive.

To create a new compressed drive, choose the Create New Drive option from the Compress menu.

You can also create a new compressed drive from the MS-DOS command prompt by using the %S /CREATE command. For more information, type HELP %S /CREATE at the command prompt.

Related Topic
-------------
  "Compressing an Existing Drive"~HL80~

@@!HLAA!100!@
 HELP --  Uncompressing a Compressed Drive

You can uncompress a %N compressed drive if there is enough free disk space to hold all the files in uncompressed form.

When you