D4.1 Introduction to hard disk firmware
D4.2  Introduction to hard Disk firmware module in service area
D4.3 Problems when firmware is corrupted
D4.4 Basic Introduction to Different Firmware repair instrument/software list
D4.4 Seagate common terminal commands idea
D4.6 Introduction and used of Seagate firmware repair tools
(smart reset, clear plist , clear glist, repair, module update, format, service area, regenerator)
D4.7 WD hard disk firmware repair tools used( clear smart, clear plist, clear glist, format, clear regenerator, module check, etc)