To recover lost data from busy undetected hard drives belongs to advanced-level data recovery cases. Users must use professional data recovery hardware tools, specially firmware repair tools to get the busy undetected hard drives ready and detected.
When the hard drives are busy and undetected, it can be mostly firmware corruption or head failure and sometimes PCB or ROM failure, if PCB failure, mostly, the PCB is not original PCB.
When the hard drives are busy and undetected, the hard drive firmware area and data area are mostly not accessible and users cannot do anything until getting drives ready.
If the busy and undetected hard drive failures are caused by firmware corruption, users can use Dolphin firmware repair tools to bypass the firmware read, or edit the ROM in safe mode, or use short connection method or how swap method to get the drives ready and detected. If the busy and undetected hard drive failures are caused by missing original PCB, this one is troublesome then, most drives cannot be recovered, some drives can be recovered by regenerating the ROM contents. If the busy and undetected hard drive failures are caused by head failure or other physical components’ damage, users need to swap the damaged heads and components to get the drive working again.
For different hard drive brands, the general data recovery concepts are the same but detailed steps can be different and users need to spend time in learning from manuals and case studies and practize on it.
But please note not all busy and undetected hard drives can be recovered, if the key data recovery modules are lost or the platters are scratched, the data is not possible to be recovered.
Any question is welcome to firstname.lastname@example.org or add Dolphin Skype ID: dolphin.data.lab