Using Compressed Files and Folders

1
Using Compressed Files and Folders

• Applications and operating systems read and write
  to compressed files.
• NTFS uncompresses the file before making it
  available.
• NTFS compresses the file when you exit or
  explicitly save the file.
• NTFS allocates disk space based on the
  uncompressed file size.

2
Compressing Files and Folders

• Set the compression state of files and folders.
• Can change the color used to display compressed
  files and folders.
• Cannot use both NTFS encryption and compression
  on files or folders.
• Must have write permission to change the
  compression state.
• Can compress a folder, the files in it, or both.
• Compress a folder and the Confirm Attribute
  Changes dialog box displays.
• Cannot use compression if the cluster sizes are
  larger than 4 KB.

3
Selecting an Alternate Color

• In Windows Explorer, on the Tools menu, click
  Folder Options.
• On the View tab, select Display Compressed Files
  And Folders With Alternate Color.

4
Copying and Moving Compressed Files and Folders
5
Using NTFS Compression

• Select the types of files to compress.
• Do not store compressed files, such as PKZIP
  files, in a compressed folder.
• Use a different display color for compressed
  files.
• Compress static data rather than data that
  changes frequently.
• Dont compress files that you copy or move
  frequently.

6
Understanding Microsoft Windows 2000 Disk Quota
Management

• Tracks and controls disk usage on a per-user,
  per-volume basis
• Bases disk usage on file and folder ownership
• Ignores compression
• Calculates free space for applications based on
  the users quota limit

6
7
System Administrators Use Disk Quotas

• To specify the amount of disk space for each user
• To set a warning when the user is nearing this
  limit
• To deny users access if they exceed their limit
• To log an event when a user exceeds a specified
  disk space threshold

8
Setting Disk Quotas
9
Determining the Status of Disk Quotas

• Red traffic light disk quotas are not enabled.
• Yellow traffic light Windows 2000 is rebuilding
  disk quota information.
• Green traffic light the disk quota system is
  active.

10
Monitoring Disk Quotas

• Displays the amount of disk space that each user
  occupies
• Displays a yellow triangle for users over their
  quota-warning threshold
• Displays a red circle for users over their quota
  limit
• Displays the warning threshold and disk quota
  limit for each user

11
Determining Best Uses of Disk Quotas

• Log on as Administrator to install additional
  components and applications.
• Clear the Deny Disk Space To Users Exceeding
  Quota Limit check box.
• Set restrictive default limits for all user
  accounts, and modify if needed.
• Share disk space equally among all users who
  share a computer.
• Set disk quotas on shared volumes, on public
  folders, and on network servers.
• Remove all files owned by a user to delete the
  users quota entry.

12
Understanding Encrypting File System (EFS)

• Allows users to encrypt NTFS files using a strong
  public key cryptographic scheme
• Allows users with roaming profiles to use the
  same key with trusted remote systems
• Requires no administrative effort to begin
• Provides backups and copies of encrypted files
  that are also encrypted
• Allows you to move or copy files and the files
  remain encrypted
• Is not defeated by temporary files created during
  editing and left unencrypted
• Provides the ability for you to set policies to
  recover EFS encrypted data

13
EFS Features

• Transparent encryption
• Strong protection of encryption keys
• Integral data recovery
• Secure temporary and paging files

14
Encrypting Files and Folders

• To encrypt files, place them in an encrypted
  folder.
• All files placed in an encrypted folder are
  encrypted.
• Compressed files cannot be encrypted.
• A file is encrypted by using file encryption
  keys.
• A file is encrypted using a different file
  encryption key for each block.
• All of the file encryption keys are stored and
  encrypted in the file header.
• Encrypted files are used just like any other
  file. Encryption is transparent.

15
Decrypting Files and Folders

• Clear the Encrypt Contents To Secure Data check
  box.
• Decrypt a file or folder if people need access to
  the file or folder.

16
Using the Cipher Command

• Cipher /e /d /sfolder_name /a /I /f
  /q /h /k file_name . . .

17
Using the Recovery Agent

• A person is designated as the recovery agent.
• The administrator of the local computer is the
  default recovery agent.
• The domain administrator is the default recovery
  agent in a domain.
• The recovery agent can open a file using his or
  her own private key.
• If the recovery agent is on another computer,
  send the file to him or her.
• A private key should not be copied to another
  computer.

18
Defragmenting Disks

• Defragmenting disks is the process of finding and
  consolidating fragmented files and folders.
• Defragmenting disks in Windows 2000 is done using
  the Disk Defragmenter utility.
• Defragmenting disks has the following goals
• Have each file or folder occupy a single
  contiguous space.
• Allow your system to access files and folders
  more efficiently
• Consolidate free space.
• Defragmenting disks can be done on FAT, FAT32,
  and NTFS volumes.

19
The Disk Defragmenter Window

• Red indicates fragmented files.
• Dark blue indicates contiguous files.
• White indicates free space on the volume.
• Green indicates system files, which cannot be
  moved.
• The Analyze button analyzes the disk for
  defragmentation.
• The Defragment button defragments the disk.

20
Using Disk Defragmenter Effectively

• Run Disk Defragmenter when the system will
  receive the least use.
• Defragment hard disks at least once a month.
• Analyze the target volume before you install
  large applications.
• Defragment your hard disk after you delete a
  large number of files.