How Do I Find and Prevent Corrupted Files?

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  1. Posts : 28
    Windows 10 Pro
       #1

    How Do I Find and Prevent Corrupted Files?


    I'm using Windows 10 Pro 1903 on my home-built PC that has 16 GB of RAM and I have a minor annoyance that technically I fixed, but I would like to understand better. I'm trying to make backups of my video (MOV) files from my internal hard drive to one of my external hard drives. I copied dozens of files and hundreds of gigabytes, when Windows abruptly said that it could not read the source file or disk. I tried copying the stuck file by itself, and found that Windows begins copying the file normally, but at 90%, the transfer rate abruptly drops to zero for several seconds, then Windows says that it cannot read the source file or disk. By experimentation, I found that Windows can copy files before that file to my desktop, but it cannot copy that file or the next file to any destination that I have so far selected. If I attempt to copy the first file while I'm copying other files in a separate copy command, both copy operations will drop almost completely when the first file reaches 90%; this implies to me that Windows is saturating the channel when trying to copy the last 10% of that file. If I continue on after completing the previous operations and start a new copy operation on the third file down the list, that file also sees an abrupt drop in read rate, before resuming transfer and completing. Files after that point copy OK. I am also able to copy the two files (and all the other files) from a backup that I had previously made on a different external hard drive.

    The two files that won't copy from the internal drive are named DSCN4660.MOV and DSCN4661.MOV. Both files will open and play in their entirety without any problem. I've run Windows disk scan on the internal drive that has the video files on it, but the scan found no errors. I compared the sizes of DSCN4660.MOV on the internal and on the external drives, but they are the same size. The only sign of trouble is that I can't copy the files off the internal drive partition where they are located. However, I was able to copy from my backup to overwrite the original, and now the files on the internal drive will copy to other partitions.

    I tried doing a Windows restore of the OS, but the process terminates with a message that an error prevents restoring my OS and no changes were made.

    Two other weird symptoms of my OS, which may or may not be related, is that when Windows boots, the post-login wallpaper suddenly becomes blurry after a split-second, instead of remaining in focus. When Windows continues to my desktop, everything looks fine.

    When I insert a USB thumb drive into my PC's USB ports, Windows lists the addition on its display of my system, but it does not pop up a new Explorer window and the toolbar does not show that I have any drives in the USB ports. I have to right-click on the drive from the primary system window and select Eject to eject the drive. My external hard drives show up normally when plugged into the same USB ports. My system has done this ever since I transferred my OS from my old HDD to my new SSD from my Macrium Reflect drive image.

    Does anyone know why my two files won't copy from my internal drive and why Windows doesn't see anything wrong with them until I try copying them? Obviously, the files were fine when I put them on my drive, or I wouldn't be able to use my backups to correct them. A practical concern is that I have no way of finding defective files until I try copying them to a blank drive, which I don't do very often for the 3 TB of video files that I generate each year. I have a file right now that was in the middle of the copy process when my home lost electrical power for a half-hour, interrupting the copy process (my PC was on battery backup, so it simply halted the copy process when the external drive went offline), but I don't remember the file name and now I wonder if that file is corrupted.
    Last edited by Opcode; 01 Feb 2020 at 10:06.
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  2. dalchina's Avatar
    Posts : 29,832
    Win 10 Pro (1903)
       #2

    Hi, first thing I'd suggest is a standard disk check:

    Hard disk sentinel (trial) gives the best instant assesssment on its GUI I know.
    Otherwise run
    Download Portable HD Tune 2.55
    this portable program- Health (SMART) and Error Scan tabs.

    I've run Windows disk scan
    I guess you mean chkdsk? e.g.
    chkdsk c: /scan
    - just checks, no fix.

    I tried doing a Windows restore of the OS,
    - do you mean Refresh? Reset? In-place repair install? Restoring from a disk image?

    A practical concern is that I have no way of finding defective files until I try copying them to a blank drive,
    Here I think that routine periodic disk imaging would help. If the disk imaging program can't read data from the source partition, typically a CRC error will be flagged and imaging aborted.

    Another possible monitoring option is to use a program like Hard Disk Sentinel (SSD's too) or Crystal Diskinfo which can generate alerts on a range of parameters, continuously monitoring the health of your disks- based on SMART parameters.
      My Computers

  3. Bree's Avatar
    Posts : 18,610
    10 Home x64 (20H2) (10 Pro on 2nd pc)
       #3

    Opcode said:
    ...when Windows boots, the post-login wallpaper suddenly becomes blurry after a split-second, instead of remaining in focus...

    That, at least, is by design. the acrylic blur effect on the sign in screen was introduced in version 1903 and can be turned off if you wish.

    Enable or Disable Acrylic Blur Effect on Sign-in Screen in Windows 10
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  4. dalchina's Avatar
    Posts : 29,832
    Win 10 Pro (1903)
       #4

    That's what I thought, then I read 'post login'..and wondered..sounded as if it's a short duration effect AFTER login... @Opcode- could you clarify when this occurs? Thanks
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  5. Callender's Avatar
    Posts : 4,047
    N/A
       #5

    I don't think that you can prevent corrupted video files except for possibly excluding them from defrag routine if you use defrag.

    How to detect?

    Grab mediapreview:

    BabelSoft / 博语软件

    Make sure that thumbnail previews are shown in explorer. Set Explorer to show medium icons and delete all videos that do not show preview thumbnail.

    Or if you want a free media browser with thumbnails:

    Diffractor: Find and organize - photos, videos and audio.
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  6. Callender's Avatar
    Posts : 4,047
    N/A
       #6

    Other option to consider. Try using Teracopy when copying video files:

    How to reliably copy data from one USB storage device, to another?

    When you cut/ copy/ paste one or more files you can choose to use Teracopy instead of explorer.


    How Do I Find and Prevent Corrupted Files?-teracopy.jpg

    Give that a try and see if you still get file corruption.

    TeraCopy for Windows - Code Sector
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  7. Posts : 28
    Windows 10 Pro
    Thread Starter
       #7

    dalchina said:
    I guess you mean chkdsk? e.g.
    chkdsk c: /scan
    - just checks, no fix.
    No, right-click on the drive, select Properties, click on the Tools tab. Select the top option, "Error checking" (requires admin credentials). Windows usually tells me in the next window that it hasn't detected any errors, but I have the option of Scanning, anyway. Select "Scan drive." Windows will run a scan of the drive. About 99% of the time, it will then tell me that it didn't detect any errors.

    If I wanted to run chkdsk, I'd use the /f option, to fix errors found on the drive. However, using that command requires a reboot if it is run on the drive containing the boot partition, as chkdsk can't scan drives that have open files. Using Scan from the Explorer menu does not require a reboot. It usually doesn't matter which I select, because Windows very rarely finds any errors on my drives. I can't remember the last time that Windows found an error on my drives, but it might have been years ago.
    dalchina said:
    do you mean Refresh? Reset? In-place repair install? Restoring from a disk image?
    From the Windows quick start menu, type restore, select "Reset this PC." You will have the option of either resetting just the system files while preserving data and app files, or wiping out everything and starting from scratch. In my experience with the most recent version of Windows 10, it doesn't matter which I select; either would fail and roll back.
    dalchina said:
    Here I think that routine periodic disk imaging would help. If the disk imaging program can't read data from the source partition, typically a CRC error will be flagged and imaging aborted.
    Macrium Reflect didn't have any problem generating a disk image of my boot partition this morning. I didn't try running it on the internal drive containing my video files (that's 8 TB of data).
    dalchina said:
    Another possible monitoring option is to use a program like Hard Disk Sentinel (SSD's too) or Crystal Diskinfo which can generate alerts on a range of parameters, continuously monitoring the health of your disks- based on SMART parameters.
    Thanks for all the suggestions. I'll have to try some of those programs.
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  8. Callender's Avatar
    Posts : 4,047
    N/A
       #8

    Just a note to say that personally I format thumb drives as NTFS if copying video onto them.
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  9. Posts : 28
    Windows 10 Pro
    Thread Starter
       #9

    Bree said:
    That, at least, is by design. the acrylic blur effect on the sign in screen was introduced in version 1903 and can be turned off if you wish.
    Enable or Disable Acrylic Blur Effect on Sign-in Screen in Windows 10
    Thanks! It's a small thing, but I enjoy looking at the pretty landscapes while my OS loads.
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  10. The Pool Man's Avatar
    Posts : 786
    10
       #10

    Opcode said:
    I'm using Windows 10 Pro 1903 on my home-built PC that has 16 GB of RAM
    I was really liking you until I saw this.

    Yours truly,

    8GBS of RAM
      My Computer


 
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