Bad sectors from chkdsk

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WacoJohn

WacoJohn

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Apr 16, 2011
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chkdsk c: returns:

Windows has checked the file system and found no problems.

473218044 KB total disk space.
60859804 KB in 113642 files.
76572 KB in 30120 indexes.
4 KB in bad sectors.
321452 KB in use by the system.
65536 KB occupied by the log file.
411960212 KB available on disk.

4096 bytes in each allocation unit.
118304511 total allocation units on disk.
102990053 allocation units available on disk.
Click to expand...

Did a full backup of C. Formatted C:. Chkdsk did NOT report any bad sectors ... assume format corrected them. Restored backup ... and chkdsk reports they are back.

I am assuming the back up must have been an image (sector by sector) backup .. and therefor they (sectors) restore as bad(?)

Can anyone lend any comments/advice? I don't think there are actually any bad sectors. This drive is not that old, ... and it has not been mishandled. I don't remember seeing anything about bad sectors until recently. I would suspect a SOFT error of some kind ...but don't know how to correct it without losing everything on it (format drive).

Windows 7-64. ST9500420AS [Hard drive] (500.11 GB) -- drive 0, s/n 5VJ8BKVR, rev 0001TSM1, Not SMART
 
Solution
Unolocogringo
Bad sectors can be hardware or software.
Hardware wise they are sectors that can no longer be read or written to. All hard drives have a small over provisioning on the platters. So when checkdisk finds a hardware bad sector that sector is marked as bad and a new sector is put into use out of the over provisioning portion. So the drive remains the same size and good.

Soft or software bad sectors can be caused by a lot of things.
Bad memory, overheating CPU, overheated memory, or overheated hard drive. Improper shut down, power failures, corrupt downloads, viruses etc.....
Both may or may not be repaired with checkdisk with the surface scan option.

I would run checkdisk again as yours appears to be software bad sectors. Which were...
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Unolocogringo

Unolocogringo

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Dec 31, 2007
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Bad sectors can be hardware or software.
Hardware wise they are sectors that can no longer be read or written to. All hard drives have a small over provisioning on the platters. So when checkdisk finds a hardware bad sector that sector is marked as bad and a new sector is put into use out of the over provisioning portion. So the drive remains the same size and good.

Soft or software bad sectors can be caused by a lot of things.
Bad memory, overheating CPU, overheated memory, or overheated hard drive. Improper shut down, power failures, corrupt downloads, viruses etc.....
Both may or may not be repaired with checkdisk with the surface scan option.

I would run checkdisk again as yours appears to be software bad sectors. Which were included in your backup.
Once it is finished and all bad sectors are reallocated or data is recovered , make a new backup.

 
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