Windows 7 64-bit Corrupting Large Files Copied To External NTFS Drives?
Jan 26, 2012
a number of backup copies of large files on external USB-connected NTFS drives differed from the source versions still on my hard drive. I also discovered that I could reproduce the issue with newly-copied files.Here are the specifics of the issue, following a series of experiments:
- On my system, copies of large files, files typically larger than 500MB, are corrupted (altered) roughly 30% of the time when copying them under Windows 7 64-bit to USB-connected NTFS-formatted external drives.
- No error occurs / no error message appears during the copy
- The file size of copy is always identical, whether or not data was altered during the copy process.
- File differences are confirmed via either the command-line "FC" command or a utility such as WinDiff
- The issue impacts copies made via the Windows GUI -OR- via command-line copy or xcopy
- The issue occurs with multiple external USB NTFS-formatted drives, no matter what make or model.
- Subsequent attempts to copy an affected file will ultimately yield an identical copy. This would seem to rule out interference by an external program such as an anti-virus program (and the only AV I am running is Microsoft Security Essentials)
- The USB drives involved pass error checks, and copies made to these drives on other (non Windows 7) systems produce identical copies
- So far, the third party utility "TeraCopy" manages to consistently produce clean copies, and therefore is a temporary workaround. This utility apparently works because it, by default, bypasses the NTFS memory caching operation used by the Windows 7 OS...a caching system which I have so far found no way of disabling.
- The problem does not appear to impact relatively small files (1 to 100MB or so). I have not found any particular threshold, but I have seen the issue impact numerous files in the 500MB neighborhood.
- The problem seems to date at least to the version of Windows 7 that was in release as far back as the Fall of 2010, as I discovered corrupted backup copies of files dating back that far. Again, the files are corrupted with respect to the original copy...NOT with respect to file structure itself.
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Feb 22, 2013
I recently got a new iMac so am trying to copy/move some files around. However ANY file i copy onto the hard disk (which is in NTFS format) are not visible in Win7. The folder into which i copied into is visible but shows size as 0 bytes, whereas there is around 1.7TB of data in that folder. ALl older folders which were created/modified in Win7 earlier are visible. If i attach the disk to the Mac, the the files are there.. Am using Paragon NTFS if that matters...
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Jan 28, 2012
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Nov 15, 2012
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Sep 2, 2012
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Jan 20, 2013
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Apr 19, 2012
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Feb 11, 2011
I have moved to Windows 7 Ultimate x64 for almost half a year, recently my hard drive was getting full and I decided to move some of the data to usb external hard drives. Both the externals I have are IDE hard drives and both are NTFS. I always use Quicksfv to make a CRC check file before I transfer the file and then run the CRC check after its been copied over to the external drive. I have used these externals in the past with Windows XP and had no problems.
However, on Windows 7 when transferring large files (usually over 1GB in size), I get corruption in the files. The corruption occurs randomly, if I recopy the files again it might be corruption free. This only occurs when copying files from internal to external, if I copy files from the external to my internal there's no corruption at all. I have tried changing the usb cables, power cable of the externals, using different usb ports but none of it helped. I scanned both externals with chkdsk and I used memtest+ for over 24hours and all the tests passed fine.
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Apr 20, 2009
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Jul 12, 2012
I have tried to copy a complete file heirarchy from one drive to a folder on another drive but found several files and folders are not being copied.
There is no report of files missed or any kind of error message.
I am actually trying to copy the contents of a friends hard drive onto a backup drive since he is getting a new computer and wants to ensure nothing is lost. I have mounted his internal 2.5 sata drive in a caddy and am copying it to my computers second internal drive.
I expected not be be able to copy certain system files. I also expected I might not to be able to copy some of his personal files due to the standard windows system protection (I am system administrator on my PC whereas of course he was administrator on his PC where the files and folders were created which I thought might be an issue). When I first tried to view some folders I was asked by the system if I wanted to allow permanent administrator priviliges to them (namely his personal directory under "Users" ). I replied yes and was thereafter allowed to descend into and view those files. Now when I copy the entire heirarchy of some 35GB I find the new folder is only 15GB. It is not just down to any compression as I have confirmed that there is only about 1/3 of the expected number of files to what was in the original. I have since tried individually copying some of the sub-folders that were missed and they copy fine on their own. As you can imagine, trying to dentify what has copied and what has not is a mammoth undertaking.
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Dec 29, 2009
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Oct 8, 2012
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Nov 4, 2011
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Jun 21, 2012
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Sep 20, 2009
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Mar 20, 2012
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May 20, 2011
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Apr 24, 2011
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Feb 11, 2012
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Nov 25, 2012
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Jul 21, 2011
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Jul 9, 2011
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Jan 15, 2013
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Mar 9, 2012
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Aug 24, 2010
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Feb 6, 2012
any computer running windows 7 but this new laptop i have (hp g6 core i5) seems to be continually corrupting memory cards out of my camera! when i first insert the memory card and view the pictures and go to change their orientation; windows comes up with a message saying it can't change it because the picture is no longer there! when you go back to view the folders on the card they appear as symbols as they have been corrupted! the first time it happened i downloaded (and purchased the key) for recovery which seems to do a good job of recovering the images. its really annoying me as to why it is happening! i'm now very careful and transfer images from the sd to the laptop straight away and safely remove the card afterwards. the laptop also corrupted a different memory card when the lid was shut and re-opened but im assuming this is because the computer was hibernating without the card being safely removed.has anybody else had this problem and if so how can it be sorted?
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Jul 2, 2012
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Jan 31, 2013
I have 2 internal-sata hard drives(320 gig. And 2tb.) and 1 external usb/2.0 hard drive (750 gig.). The pc is an old dell gx520 tower with a fresh install of Windows 7 pro. No antivirus, network connection, or firewall enabled. Processor is a Pentium4 running 3 GHz with 1.5 gigs of ram. This is the problem: If I do a search on the 2tb. Drive for all of the jpegs, I have a total of about 84000 pictures. When I select all of the pictures and right click-copy and try to paste to another hard drive the pc will lock up and won't display a copy status window. Windows says it's not responding. Now, if I right click-copy a single folder which has anywhere, from a few files to several hundred gigs. of data in it, using the same 2tb. Drive, it will copy over to another drive just fine. I have tried, changing the swap file from "windows managed" to, up to 20 gig. Thinking the search was maybe having to write to the swap file. This didn't work. I also booted in to safe mode and tried to do the copy from the 2tb. To the 320gig. drive and still no difference. I have tried this with windows copy handler and teracopy. It all has something to do with the fact that I am doing a search for the files before copying them.
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Dec 1, 2011
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Aug 13, 2009
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