hi all, I was a beginner who wants to repair the hard drive.
My problem is most perplexing is when I see bad sectors on a hard disk,
  I always fail to eliminate the bad sectors,
My first step to do that is through MHDD,
erase, scan. regenerator. and even then it can not be fruitless .. i try with MRT. but there is a bad sector that is very difficult to remove. ie bad sectors are colored orange.

meanwhile, I was in demand to get rid of bad sectors on the hard disk.
why it is difficult to remove bad sectors can be eliminated,, whether or not,,,?

Can you guys help me,, gives direction to me, if bad sectors need tools, what tools should I use.
  as long as the bad sectors can be eliminated,, I will pull through anything.
thanks.

what hdd you need To repair?
MRT not good in all brands
mention brands you need to repair and i will advise you with good tools

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@spildit: why the bad sector can not be removed,
so what should I do if I see who have problems on the hard disk bad sector ..
  while my company is engaged in the service hard drive ..
we do not protect the data, my job just fix ..
  whether there is a solution.

@ Hpw333: I repair all brands of hard drives ..
and tools that I have at this time only the MRT, PC3000, DFL.
could you give me a solution

Bad sectors are physical mechanical failures on the platters. You can't fix hardware failures with software, ever.

This seems pretty sketchy, just saying. Not judging you, but it sounds like you are trying to sell off dying hard drives as refurbished or working ones.

A bad sector on a hard drive is simply a tiny cluster of storage space a sector of the hard drive that appears to be defective. The sector won’t respond to read or write requests.Bad sectors can occur on both traditional magnetic hard drives and modern solid-state drives. There are two types of bad sectors .one resulting from physical damage that can’t be repaired, and one resulting from software errors that can be fixed.