!!! I Am A HDD !!!
Amarbir Singh Dhillon
UT ,India .Ph : 09815000133
What Is a HDD :
Well HDD Is A Computer Part
In which Using a Disc Platter Assembly The Information is Encoded
On The Platter By The Head ,The Head send out signals and
the info is recorded on the media ,The media is magnetic in nature .We
all use hdd of different sizes and performance levels and Interfaces .
of the HDD :
MHA Assembly :
Asembly ,This is Also Know As head and platter assembly ,This is the
Part that Contains The Motor ,The Platters ,the Head And The entire Iron
Cage With The Top Cover Thats Air Sealed "Actually Air does Flow into
the HDD Chamber ,More About This Later On ".
T This is Called
The Printed Circuit Board ,this Contains The Main Processor ,The EPROM
,RAM And The Motor And Spindle Controller .This Also Has a Protection
Circuit for Protection of surges In The 12 And 5 Volt Electrical Line .
of the Parts :
PCB Plate Parts:
Main Processor :
This Processor is made By many different electronic Manufacturers Like
ST Micro And All ,Mostly they Are Specifically Made Processor For
Different HDD Manufacturers And Have Many Models even For One HDD
Manufacturer .This Processor contains The Software code that Makes the
HDD Work I Mean Its The code Or The Operating system That starts As Soon
As the PCB And The HDD Recieves Power ,If You Find That Your HDD Is
Totally Dead That Might be due To the Fact That the Crystal That Gives
Clock Signal to The Main Processor is Dead ,Try To check That With a
Scope or a Multimeter If Its Generating Frequency With Accuracy .Mostely
The Heads Are Controller By This IC In HDD .
This Contains The code That Is In Addition To the Microcontroller "Main
Processor " Code ,Some HDD Microcontrollers Do Not Have Enough Space For
The Code ,So The HDD Manufacturers Put Additional Code Into the Serial
Or Parallel EPROM On The PCB . Once the Microcontroller Processes All
Its Firmware akka operating code It Sends a Jump Instruction To The
EPROM And The EPROM starts Executing Its Code .The Probability Of the
EPROM Code Getting Damaged In The PCB is Very Very High ,You Could Take
Out This EPROM And Program It With the Same Firmware Version Or
Alternatively You Could Connect the PCB to The Serial Port on the
Computer and Then program the same ,Yes The PCB also Has a Serial Port
,More About That Later On.Serial Port is There For Samsung And Seagate
This IC Is Also There On The PCB and Its As Ram In Our Desktop Computers
,This Could also Get Damaged And Could Require Replacement .This Also
Can Be Checked And Replaced If Found Defective ,A Defective Ram IC Will
process everything with Erros in the PCB .
This IC controls the Speed of the Spindle Motor In The HDD ,A Defective
Spindle Motor Is Rather common Issue ,Most Commonly this Chip just
blows away Due To The Fact That the Spindle Motor Gets a Coil Short
Circuit or Due To The Fact The Motor Sometimes Freezes or Tries To
Consume More Power Then The IC Can Deliver .
Under Progress ......