1.    17 Sep 2017 #1
    Join Date : Aug 2015
    Posts : 29
    Windows 10 Pro 64bit

    Folder copy, source/destination contents do not match in Explorer


    hello!

    for some reason, after doing some successful folder copies (ie no errors) from my external USB drive to my RAID 1 NAS, the contents of some source folders and their respective destination folders do not match in windows explorer, ie file/folder count and size are different. other folder copies do not appear to have this issue, only a select few.

    the USB drive is FAT32, the NAS is EXT3, though windows explorer sees it as NTFS.

    for example, here's what i'm seeing in windows explorer when i right-click/properties on a source and destination folder..

    - source folder
    folders = 575
    files = 75
    size = 28.5 GB (this is not size on disk)

    - destination folder
    folders = 583
    files = 80
    size = 31.6 GB

    if i hover the mouse pointer over the source folder, the tooltop shows 33.8 GB, which more closely matches the destination folder properties (tooltip for the destination folder also shows 33.8 GB).

    if i look at the folder properties for the source folder under linux (parted magic live disc), the numbers are closer to what the destination shows in windows explorer, size is a couple GB higher under linux vs windows- not sure if linux serves as a good test.

    my question, is what i'm seeing for the source folder properties in windows explorer a "misread", or is it possible that there was an issue with the copy process that i'm not seeing? the USB drive contains important data and i want to make sure i have an exact copy on the NAS before i wipe the USB drive to reuse it.

    i've done the folder copy using a few other file managers (explorer++, xyplorer) but i get the same results.

    thanks for your time!
      My ComputerSystem Spec
  2.    17 Sep 2017 #2
    Join Date : Nov 2013
    Chicagoland
    Posts : 33,999
    Dual boot Windows 10 FCU Pro x 64 & Insider 10 Pro

    Hi there. It's just the way Windows catalogues the files. It creates some hidden desktop.ini files and such. I wouldn't be concerned about it, however, real important files should be backed up in at least 2 places. Do you have another thumb or DVD you could copy to as well? How about OneDrive or other cloud storage?
      My ComputersSystem Spec
  3.    17 Sep 2017 #3
    Join Date : Aug 2015
    Posts : 29
    Windows 10 Pro 64bit
    Thread Starter

    Quote Originally Posted by HippsieGypsie View Post
    Hi there. It's just the way Windows catalogues the files. It creates some hidden desktop.ini files and such. I wouldn't be concerned about it, however, real important files should be backed up in at least 2 places. Do you have another thumb or DVD you could copy to as well? How about OneDrive or other cloud storage?
    thanks for the response! i don't have another storage device at the moment, and the USB drive has 500 GB of data in total so DVDs and cloud storage probably wouldn't work.

    if this is in fact just the way Windows catalogues files as you suggested, why would it only affect some folders but not others? would file types have a bearing on this? the difference in files/folders count and size between source and destination (in my opinion) seems a little too steep to be just hidden ini files etc- the size difference alone is 3 GB..
      My ComputerSystem Spec
  4.    21 Sep 2017 #4
    Join Date : Nov 2013
    Chicagoland
    Posts : 33,999
    Dual boot Windows 10 FCU Pro x 64 & Insider 10 Pro

    @Matt26

    Sorry, but this got hidden in my 2nd subscription page and overlooked it.

    I'm not that knowledgeable to know how File Explorer works. I searched the TechNet site and the web to no avail. I'm sure it's quite complicated. Each OS has its different version as explained in the article below. Better indexing for querying is probably a factor.

    File Explorer - Wikipedia

    How are you doing on this?
      My ComputersSystem Spec
  5.    26 Sep 2017 #5
    Join Date : Aug 2015
    Posts : 29
    Windows 10 Pro 64bit
    Thread Starter

    Quote Originally Posted by HippsieGypsie View Post
    @Matt26

    Sorry, but this got hidden in my 2nd subscription page and overlooked it.

    I'm not that knowledgeable to know how File Explorer works. I searched the TechNet site and the web to no avail. I'm sure it's quite complicated. Each OS has its different version as explained in the article below. Better indexing for querying is probably a factor.

    File Explorer - Wikipedia

    How are you doing on this?
    i'm getting gradually baffled by this to be honest.. seems like a FAT32 issue based on my readings, more specifically maybe related to large files (like 4+ GB). as a test, i formatted a spare 60GB USB drive as FAT32, then copied one of the problematic source folders to this drive- my theory being that if FAT32 is the issue, the destination folder in this test should show the same "misread" of folder properties as the source (ie, show file, folder and size counts as lower than actual); unfortunately this didn't happen- the FAT32 test drive showed the folder properties accurately, so i'm at a loss.. i wonder if i were to plug the source USB drive into a computer with a FAT32 OS, would that make a difference? i just wish i could find a way to either get windows explorer to show the folder properties correctly, or find a third party alternative that can- i'd use linux, which appears to read the problematic source folders accurately, but linux (ubunutu anyways) doesn't give file and folder count details, just size- and only in GB, doesn't show byte count..
      My ComputerSystem Spec
  6.    26 Sep 2017 #6
    Join Date : May 2014
    Cross Plains, WI
    Posts : 318
    Windows 10 Pro x64

    Quote Originally Posted by Matt26 View Post
    i'm getting gradually baffled by this to be honest.. seems like a FAT32 issue based on my readings, more specifically maybe related to large files (like 4+ GB). as a test, i formatted a spare 60GB USB drive as FAT32, then copied one of the problematic source folders to this drive- my theory being that if FAT32 is the issue, the destination folder in this test should show the same "misread" of folder properties as the source (ie, show file, folder and size counts as lower than actual); unfortunately this didn't happen- the FAT32 test drive showed the folder properties accurately, so i'm at a loss.. i wonder if i were to plug the source USB drive into a computer with a FAT32 OS, would that make a difference? i just wish i could find a way to either get windows explorer to show the folder properties correctly, or find a third party alternative that can- i'd use linux, which appears to read the problematic source folders accurately, but linux (ubunutu anyways) doesn't give file and folder count details, just size- and only in GB, doesn't show byte count..
    I think what might be at least part of the issue is you are going from one file system to another. Each file system has a different way that it estimates file and folder size, the way they catalog the files are different as well.

    FAT uses a File Allocation Table and NTFS uses the MFT (or Master File Table) to catalog the files. FAT32 has a maximum single file size of 4GB because of the way it works. I agree that is a rather large discrepancy you are seeing. I would try to open and work with some of the files that are in these folders that have this issue to see if they are changed or corrupted in any way. In my opinion, I wouldn't worry about it too much as long as you have some sort of backup.

    EXT3 is a partition type that UNIX and UNIX based OSs use, I dont know much about that one.
      My ComputersSystem Spec
  7.    27 Sep 2017 #7
    Join Date : Nov 2015
    Posts : 144
    W10

    For backup and comparison between two folders I use the freeware FreeFileSync. It tells you whether there are differences between the two folders. It works also in a network environment.
      My ComputerSystem Spec

 


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