FORMATTING CONCEPT .

In this post i’m going to describe the concept of formatting and how its done . You all know whats format , to clean or delete the unwanted/malicious data from any storage device is what format is all about . Yeah that’s correct but there much more than that  what we are going to discuss in this post is the concept of formatting and  its types .

formatting

Formatting :- In simpler words formatting means changes of orientation in within the harddisk .

Now there are two types of formatting :

  1.  Low level formatting
  2. High level formatting

  Low level formatting is been used by manufacturers .

    High level formatting is been used by users . 

CHANGES THAT OCCUR UNDER LOW LEVEL FORMATTING :

  • Track , head , sector , cylinder no. is generated .
  • Location MBR
  • Landing Zone is declared
  • WPCOM is generated  . ( WPcom stands for write precompensation is a technical aspect of all digital magnetic recordings like harddisk , floppy disk . It ensures that the analog write signal that will later be read back will be as close as possible to the unmodified write signal . It holds the  non-linear properties of magnetic recording surfaces . )
  • Interleaving is designed .   (  Interleaving is a technique used by harddisk to arrange data accessed sequentially into non-sequential sectors which improves access performance .)
  • Servo surface is generated  . ( stores index surface , dedicated surface and embedded surface )

 

CHANGES THAT OCCUR UNDER HIGH LEVEL FORMATTING :

  • Root directory is created .
  • If its  Fat16 two copies is generated  ( FAT16 #1      FAT16#2)
  • If its  FAT32 , 4-60 copies is generated
  • If its NTFS only 1 copy is genertaed  ( because its a composite file system )
  • VBR is generated  .  ( VBR stands for volume boot record . Each drive has its own local sector called VBR . )
  • It checks the disk surface for any false . ( it repairs if there’s any false, if it doesn’t repair then sector sparing is active for that sector. )

 

Now There’s one more thing about formatting which you all guys are familiar with

  • Quick format 
  • Full format 

BUT Whats the difference between quick format and full format .

  • Firstly quick format is quicker than full format .
  • When you choose full format it does takes time because it checks for any bad sector in that partition and also create Track , head , sector , cylinder by removing the old one , whereas in quick format it doesn’t scan disk for any bad sectors . Also the Track , head , sector , cylinder remains same only data is been flushed out .

 

 

 

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