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Slow Computer because of a Corrupt block on my hard drive?

This is a discussion on Slow Computer because of a Corrupt block on my hard drive? within the Hard Drive Support forums, part of the Tech Support Forum category. My computer all of a sudden started running really slow. I go to school in Grenada and the electricity isn't


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Old 06-23-2007, 12:19 AM   #1
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My computer all of a sudden started running really slow. I go to school in Grenada and the electricity isn't always very stable, I have a surge protector to protect against electricity spikes, but is it possible that the electricity dipped low and caused my hard drive to spin slower and get damaged that way? Just because this is my second hard drive ruined on this island. They were both Toshiba hard drives the first was in a toshiba laptop and now in a dell.
Anyway virus scans and spyware scans came up clean, i ran multiple updated programs to check this so i am 95% sure this is not due to a virus or spyware. I ran a check disk and it found a corrupt block on my hard drive, and I am assuming it "fixed" the problem but my computer is still running slow.. What do I do now? I have read that having one corrupt block isn't bad, and that most laptop hard drives have one corrupt block. So why is my computer still slow? Do I just need to reformat and from then on my computer will run fine? Also if I reformat won't that erase the part that was marked by check disk as unusable, and windows will not avoid that corrupt part of the hard drive when i re-install the OS.
Thank you for any help.

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Old 06-23-2007, 04:55 AM   #2
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Power dips are probably responsible for more damaged hardware than
power spikes. "brownout" You should use a ups. This gives a constant
clean flow of power. The fact that your pc, or laptop is running slow
may or may not be from a harddrive going south. The brownouts could
have damaged something else. Hard to say.

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Old 06-23-2007, 06:29 PM   #3
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I have done a full diagnostic test, and the only hardware that wasn't working properly was my Hard Drive, I have done disk checks and have operantly fixed the problem however my computer is still running slow, what is my next step? Do I re-install windows? Do I reformat? Will reformating cause the info to be written on the corrupt portions of the hard drive again and cause the same problems?
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Old 06-23-2007, 06:50 PM   #4
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when faulty HDD sectors are 'repaired' they are actually blocked from further use in the future, so there should be no problem with formatting and doing a clean install...

sounds like you have some sort of other issue besides the HDD like malware a virus/trojan or perhaps a new program installed that is eating away at your resources...

hit ctrl-alt-delete to open up your task manager and watch to see if any process is spiraling out of control...if you see one choose to 'end process' and see if your computer speeds up...then ferret out exactly what process it is and try permanently killing it...

this can be a PITA, and to be honest I rarely spend the time to figure it out and rather choose to do what you have described...reformat/clean install..
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Old 06-23-2007, 07:44 PM   #5
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Yes, if your HDD is has many corrupt sectors that it has to reallocate and remap (something transparent to the end user), then you will have very slow computer performance no matter which system it is - especially bootup.

The articles I wanted to link from TSF are no where to be found right now.

Anyway, download, install and run Speedfan: http://www.almico.com/speedfan.php

Go over to the SMART Disk Status tab and choose the drive - click on "Perform an in-depth online analysis of the hard disk"

It will try and access a website and allow it permission to. read the information it posts about your HDD and if possible give us a screenshot back or the rough contents of the condition report.

Tiny fluctuations, especially dirty line noise which is not cut out of the PSU/cable transient filtering can damage a HDD very quickly.
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Old 06-24-2007, 08:43 PM   #6
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ok there's the in depth report about my hard drive.. I am not worried about virus/spyware because i can reformat and that will clean everything up and make it all better, but if there's a hardware problem i can't fix that by reformatting. Anyway also the report says that my power on time is too long.. meaning my hard drive has been on for more than average amount of time, but my computer is only 1.5 years old and i have been turning it off every night, so it's on probably about 8-14 hours a day, could it be possible that dell sold me a computer that they made with a used hard drive? Also how do I remap a spare sector? It says that i have plenty of spare sectors and I should remap the files that were in the damages sector to a spare sector. how do i do that? will a simple reformat do that for me?

Thank you so much for your help guys. I am posting on 2 other tech forums and you guys are by far being the most helpful. I really appreciate your help.
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Old 06-24-2007, 09:14 PM   #7
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Quote:
Originally Posted by Wozer View Post
when faulty HDD sectors are 'repaired' they are actually blocked from further use in the future, so there should be no problem with formatting and doing a clean install...

sounds like you have some sort of other issue besides the HDD like malware a virus/trojan or perhaps a new program installed that is eating away at your resources...

hit ctrl-alt-delete to open up your task manager and watch to see if any process is spiraling out of control...if you see one choose to 'end process' and see if your computer speeds up...then ferret out exactly what process it is and try permanently killing it...

this can be a PITA, and to be honest I rarely spend the time to figure it out and rather choose to do what you have described...reformat/clean install..
Every time i get a temp spike that causes my fan to go on i check the task manager and see what's causing the spike. And I don't any program that's using up more cpu than usual. So i am pretty sure it's just that the corrupt sector has some important files in it that are now missing and thus the computer is running slow, so a reformat and reinstall should solve all that, as long new files aren't written on the corrupt block.

thanks for the help.
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Old 06-26-2007, 02:04 PM   #8
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Try running a chkdsk /f /r from Command Prompt (agree to run it at next startup) and see how that goes.

You don't have corrupt reallocated sectors yet.
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Old 06-27-2007, 11:20 AM   #9
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Quote:
Originally Posted by Kalim View Post
Try running a chkdsk /f /r from Command Prompt (agree to run it at next startup) and see how that goes.

You don't have corrupt reallocated sectors yet.
here are the log results from the scan. I guess it didn't find anything wrong with the hard drive... I think reformatting will solve my problems of slow start up, and slow performance. Thanks for your help.

Checking file system on C:
The type of the file system is NTFS.
Volume label is System.

A disk check has been scheduled.
Windows will now check the disk.
Cleaning up minor inconsistencies on the drive.
Cleaning up 4 unused index entries from index $SII of file 0x9.
Cleaning up 4 unused index entries from index $SDH of file 0x9.
Cleaning up 4 unused security descriptors.
CHKDSK is verifying file data (stage 4 of 5)...
File data verification completed.
CHKDSK is verifying free space (stage 5 of 5)...
Free space verification is complete.

21679717 KB total disk space.
14600140 KB in 66045 files.
25524 KB in 5882 indexes.
4 KB in bad sectors.
295393 KB in use by the system.
65536 KB occupied by the log file.
6758656 KB available on disk.

4096 bytes in each allocation unit.
5419929 total allocation units on disk.
1689664 allocation units available on disk.

Internal Info:
10 4d 01 00 02 19 01 00 e3 aa 01 00 00 00 00 00 .M..............
8c 01 00 00 01 00 00 00 5e 04 00 00 00 00 00 00 ........^.......
e0 50 19 0e 00 00 00 00 e0 f0 f0 3b 00 00 00 00 .P.........;....
b0 3b 93 76 00 00 00 00 c0 f2 05 0f 0a 00 00 00 .;.v............
a0 dc d2 a2 00 00 00 00 b0 4b 0b 83 0b 00 00 00 .........K......
99 9e 36 00 00 00 00 00 a0 39 07 00 fd 01 01 00 ..6......9......
00 00 00 00 00 30 1f 7b 03 00 00 00 fa 16 00 00 .....0.{........

Windows has finished checking your disk.
Please wait while your computer restarts.


For more information, see Help and Support Center at
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Old 06-27-2007, 01:23 PM   #10
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Quote:
Originally Posted by RussianJoo View Post
here are the log results from the scan. I guess it didn't find anything wrong with the hard drive... I think reformatting will solve my problems of slow start up, and slow performance. Thanks for your help.
Yea, there's not enough there to make a difference to your HDD/OS performance. The problem is elsewhere, try checking if your CPU is throttling (what speed it's constantly at) and even try BootVis (bootup analysis) to see what is impairing the bootup speed.
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Old 06-27-2007, 02:50 PM   #11
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my final 2¢:

if you value your time, and are not super experienced in tracking down problems plaguing your system, then by all means backup data and reformat...this has always been my attitude as I've found that in my case I can reinstall the OS faster than trying to track down every little thing 'wrong' going on..and you know a clean install is..well...CLEAN!...the last time I took the effort to figure out what was causing problems I spent about 8 hours to correctly deduce and solve the issue...turns out it was a new hosts file I had installed and its presence was eating up cpu like there was no end...sheesh...the creator of said hosts file got a rather nasty message from me...

I admit to 'guessing' that the number of sectors damages was minimal, and Kalim was correct to point out that the amount of damage to your HDD variably affects performance..i.e. the more damaged sectors the more effect it will have on performance...
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Old 06-27-2007, 05:44 PM   #12
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A clean format always offers the best of both worlds and saves many Windows headaches.
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Old 06-28-2007, 08:55 AM   #13
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Thanks guys. I always choose to reformat too, and i haven't reformatted this machine in about 1.5 years so it's time to clean it up. It's just that I wanted to know what caused this so that it doesn't happen again after i reformat. That's the thing it's slow on boot up, and shut down, and when I try to open new programs and that's when the CPU shoots up and then fan goes on, otherwise the CPU isn't working at all, when the computer is idle the computer temp is at 47 degrees C which is cool for a 700M, and the CPU isn't used at all, so I don't think it's a virus or spyware (also because I have run multiple different antivirus and antispyware programs and they have come up with nothing.) Also I haven't installed any new software for the last 6 months at least, so it's not that I installed something and that changed my registry or hosts files. So that's why i am just really confused why this happened, and it seems like the hard drive problems would be the only logical thing that could cause this especially since I live on a caribbean island for most of the year with unstable electricity.
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Old 06-28-2007, 08:58 AM   #14
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by the way i looked back and i never posted the even log for the disk check that i ran first once i noticed the problem. here it is.

Checking file system on C:
The type of the file system is NTFS.
Volume label is System.

A disk check has been scheduled.
Windows will now check the disk.
Read failure with status 0xc000009c at offset 0xc2c20000 for 0x10000 bytes.
Read failure with status 0xc000009c at offset 0xc2c25000 for 0x1000 bytes.
File record segment 45204 is unreadable.
Read failure with status 0xc000009c at offset 0xc2c25000 for 0x1000 bytes.
File record segment 45205 is unreadable.
Read failure with status 0xc000009c at offset 0xc2c25000 for 0x1000 bytes.
File record segment 45206 is unreadable.
Read failure with status 0xc000009c at offset 0xc2c25000 for 0x1000 bytes.
File record segment 45207 is unreadable.
Read failure with status 0xc000009c at offset 0xc2c25400 for 0x400 bytes.
Index entry reg00479 of index $I30 in file 0xa8e5 points to unused file 0xb095.
Deleting index entry reg00479 in index $I30 of file 43237.
Cleaning up minor inconsistencies on the drive.
CHKDSK is recovering lost files.
Cleaning up 2851 unused index entries from index $SII of file 0x9.
Cleaning up 2851 unused index entries from index $SDH of file 0x9.
Cleaning up 2851 unused security descriptors.
CHKDSK is verifying file data (stage 4 of 5)...
File data verification completed.
CHKDSK is verifying free space (stage 5 of 5)...
Free space verification is complete.
Adding 1 bad clusters to the Bad Clusters File.
Correcting errors in the master file table's (MFT) DATA attribute.
CHKDSK discovered free space marked as allocated in the
master file table (MFT) bitmap.
Correcting errors in the Volume Bitmap.
Windows has made corrections to the file system.

21679717 KB total disk space.
19412588 KB in 70278 files.
27084 KB in 5846 indexes.
4 KB in bad sectors.
295389 KB in use by the system.
65536 KB occupied by the log file.
1944652 KB available on disk.

4096 bytes in each allocation unit.
5419929 total allocation units on disk.
486163 allocation units available on disk.

Internal Info:
10 4d 01 00 67 29 01 00 49 c9 01 00 00 00 00 00 .M..g)..I.......
89 01 00 00 01 00 00 00 66 0f 00 00 00 00 00 00 ........f.......
30 e6 19 22 00 00 00 00 70 9a db 4a 00 00 00 00 0.."....p..J....
d0 24 b3 eb 00 00 00 00 50 ad 45 a5 0e 00 00 00 .$......P.E.....
f0 32 1a 3c 00 00 00 00 b0 16 7a 50 10 00 00 00 .2.<......zP....
99 9e 36 00 00 00 00 00 a0 39 07 00 86 12 01 00 ..6......9......
00 00 00 00 00 b0 d9 a0 04 00 00 00 d6 16 00 00 ................

Windows has finished checking your disk.
Please wait while your computer restarts.


For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Old 06-28-2007, 09:00 AM   #15
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And then 3 days after i ran that disk check this came up when i started my computer. So I definitely had hard drive problems. But I guess they got "fixed".
Checking file system on C:
The type of the file system is NTFS.
Volume label is System.


One of your disks needs to be checked for consistency. You
may cancel the disk check, but it is strongly recommended
that you continue.
Windows will now check the disk.
The file reference 0x2800000000b094 of index entry iPodSettings.nib of index $I30
with parent 0xa273 is not the same as 0x2900000000b094.
Deleting index entry iPodSettings.nib in index $I30 of file 41587.
The file reference 0x2800000000b094 of index entry IPODSE~1.NIB of index $I30
with parent 0xa273 is not the same as 0x2900000000b094.
Deleting index entry IPODSE~1.NIB in index $I30 of file 41587.
The file reference 0x900000000b097 of index entry reg00480 of index $I30
with parent 0xa8e5 is not the same as 0x1800000000b097.
Deleting index entry reg00480 in index $I30 of file 43237.
Cleaning up minor inconsistencies on the drive.
CHKDSK is recovering lost files.
Cleaning up 4 unused index entries from index $SII of file 0x9.
Cleaning up 4 unused index entries from index $SDH of file 0x9.
Cleaning up 4 unused security descriptors.
Correcting errors in the master file table's (MFT) BITMAP attribute.
Windows has made corrections to the file system.

21679717 KB total disk space.
19797404 KB in 70386 files.
27096 KB in 5854 indexes.
4 KB in bad sectors.
295389 KB in use by the system.
65536 KB occupied by the log file.
1559824 KB available on disk.

4096 bytes in each allocation unit.
5419929 total allocation units on disk.
389956 allocation units available on disk.

Internal Info:
10 4d 01 00 d9 29 01 00 1d ca 01 00 00 00 00 00 .M...)..........
89 01 00 00 01 00 00 00 47 04 00 00 00 00 00 00 ........G.......
c0 b2 f7 0d 00 00 00 00 40 b0 1d 43 00 00 00 00 ........@..C....
c0 b1 5a 76 00 00 00 00 00 00 00 00 00 00 00 00 ..Zv............
00 00 00 00 00 00 00 00 00 7b 51 d8 00 00 00 00 .........{Q.....
99 9e 36 00 00 00 00 00 78 35 07 00 f2 12 01 00 ..6.....x5......
00 00 00 00 00 70 56 b8 04 00 00 00 de 16 00 00 .....pV.........

Windows has finished checking your disk.
Please wait while your computer restarts.


For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Old 06-28-2007, 02:56 PM   #16
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Yes, those are HDD problems. To make sure there's nothing wrong with the HDD condition, run the HDD Diagnostic Tool by make/model: http://www.techsupportforum.com/827480-post44.html

It's added security, as a reformat will not fix physical errors and every tool but the manufacturers can be inaccurate about the HDD condition.

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