@learner
Nobody is forcing you to purchase anything. Just becasue you did not get the answer you were looking for and someone to offer you a manual that is 200+ pages and some repair video for free. I am a money minded business woman. After you have been in this field, done your research, invested your money, time, and write a book for a tool or HDD please send me a copy for free. I would love to see you hand this work out to anyone and everyone that comes here for free.
@chinopk
Sorry this one seemed funny to me and not real. If you are in DR or work here a LDR is made from a good working drive and saved by the use of special tools or prorgam. The LDR is used to start a drive that can not work.
Modules or Mods are in the SA of the HDD and used by the HDD to be read and start the drive to work. You will need to find out what mods you want to learn about. Such as plist is factory defect list that is done before leaving factory, and glist is growing defect list this is made during drive usage and identifies bad sectors. These too are saved from a good working drive and used to repair the ones that go bad in the SA during usage.
Firmware is the well you know FW. This is the revision of the HDD. As you know from Seagate different FW can be defective and you have to update it. But FW is not like a cell phone you can not flash it at well.
This is a simple break down of what they are. You learner should of answered his question instead of answering the way you did.