Module 1 Features of OS

Module  I   Features of OS

1. Defragmentation or Optimize

It means to arrange data in the disk, it is use for better performance of a computer, it can be use in any OS, it can be use for partitions and not for file, folder. We can defragment multiple partitions at a time.

step:-

C: (any partition)  -> Properties      ->  Tools tab    -> Defragment  now

2. Compression

It means to reduce size of data, it is use to get more disk space, it can be use for file, folder and partition.  It is recommended that it should not be use for system partitions.  It is feature of NTFS only. We can see the compress files in blue colour.  Users can work normally in the compress file, if having permission.

step:-

File   -> Properties    -> General tab    -> Advance    -> Compress    -> OK 

3. Encryption

It means coding of data or it means to change data into unreadable format. It is use for network security purpose. It can be use for file, folder and partition. It is feature of NTFS only. We can see the encrypted files in green colour.  Users can work normally in the encrypted files, if having permission.  MPPE (Microsoft Point to Point Encryption ) protocol and  DES (Data Encryption Standard)  is use for encryption in Windows OS.  There are 3 levels of encryption :-

          Low level                      =       40 bit

          Medium level                =       56 bit

          High level                     =       128bit

step:-

File   -> Properties    -> General tab    -> Advance    -> Encryption   -> OK

NOTE: Compression and Encryption cannot be use together manually for same file.

4. Disk Quota

It is feature of Windows 2000 and higher version, it is feature of NTFS and it can be use for partitions. It is mostly use for file server machine.

Disk quota means to limit the disk space for users and to restrict user for the disk usage. It is use to save hard disk space or storage space from misuse.

We can apply disk quota feature for  the entire partition but it is mostly use for user profile.

step:-

C:   -> Properties    -> Quota tab    ->                   Enable Quota Management

                                                                Deny disk space

-> Do not limit disk usage   -> Quota entries    -> Quota menu    ->

New quota entries   -> Select users  -> Limit disk usage   [ 1 GB ]    -> OK

5. Shadow  Copies

It is feature of Windows server 2003,2008 and 2012. It can be use in the domain or workgroup network. Client machine must be atleast windows XP. It is mostly use for file server machine and it is feature of NTFS. It is use for partitions, not for file and folder.

Shadow Copies means an image of entire partition will be create within a partition and user can check the previous versions of his data and can also recover the deleted files. It is not like backup but work as link. This image can be create manually or we can set schedule but first image or shadow copy will be create automatically when we enable shadow copies feature.

step:-

Create a sharefolder on server for testing purpose in C: drive   ->

C:    -> Properties   -> Shadow copies tab    -> Enable on C:  -> OK

Client machine :-    RUN    \\servername    -> sharefolder   -> properties   ->

                                Previous version tab    -> Open

6. Virtual Memory

It means we can use some portion of hard disk as RAM for better performance. It will actually increase the size of          c:\pagefile.sys and more programs or applications can be run at a time. We cannot use maximum 10% of active partition or maximum RAM x 5