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Hard Disk Drive (HDD) Bad Sector Recovery- Part 2

By on April 4, 2014








Part 1- Click HERE


Now restart the scan without erasing.

seagate harddisk repair

As we can see bad sector on sector 1810245 (pic 04) is repaired.

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Full scan is done, There are no bad/unreadable sectors on the drive but there is a lot of slowsectors. It is good that there are no more bad sectors only slow ones but I personally  don’t like to use drive areas with slow sectors because they can lead to windows crashes, or freezing the pc for a second or two, or corrupting data after some time.

Either try to repair them or remove them from further  use in partitions.

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You can set the program to try running multiple rewrites of the same area on the disk if there is a slow or bad sector. I had a slow sectors between 270388000 and 270389000 sectors, so I set the program to scan only between those sector in loop and if slow or bad sectors are found to erase them.

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Sometimes it can improve the sectors but sometimes it can’t. It can take a lot of time to scan each bad/slow area individually, you can set the program to loop erasing scan through several gigabytes or even set it to loop erase scan whole disk over night.

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After some time I isolated several groups of slow and unrecoverable areas on disk and several clean areas on the disk.

From begining to 61000000 sectors = slow

61000000 to 134000000 = good

134000000-164000000 = slow

164000000-616000000 = good

616000000-632000000 = slow

632000000-756000000 = good

756000000-909000000 = slow

909000000-END = good

Now we need to recalculate sectors to megabytes:

SECTOR / 2 / 1024 = megabyte ( one sector is 512 bytes)

61000000 / 2 / 1024 = 29785 megabytes


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Making a bit of fine tuning to numbers. Add a bit to the beginning and end of bad areas. I rounded them all on 100mb.

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Now that I had numbers I had to make partitions. I used linux from hirens cd for this task, but you can do it from dos or windows as well.

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To be continued……………..

This article was prepared for you by  David Car  from Koprivnica Croatia. He has the passion for Electronics and Computers.

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  1. Amir

    February 28, 2018 at 2:57 am

    Hi Justin,
    I am looking for low cost multi slot repair machine tools useing MHDD to repair SATA Seagate or WD 2,5" & 3.5",
    i know China has some 10slot machine with lcd (looks like bay)
    i need to repair daily 1000pcs or 2000pcs of hdd bad sectors,

    • Jestine Yong

      March 2, 2018 at 9:46 am

      HI Amir,

      Sorry I do not have such info. Perhaps you can try search from aliexpress or even from



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