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Hello
I was directed here after a topic I opened in the Microsoft Community forum.
After I opened the topic, I continued to do tests about the problem and reached the results that I will state below.
I am connecting to a hard drive connected to the router using SMB 1.0 on Windows 11 Pro (Build 22621.1). I can read files from this HDD without any problems and write files of 481KB or larger to the HDD without any problems. But I cannot write 480KB or smaller files to HDD.
At first I thought the problem was with the SRT files as I was trying to write the SRT and MKV files to the HDD. MKV files were copied without any problems. However, as a result of my experiments, I realized that I could not copy 480KB and smaller files, regardless of file type. I created different size files using the below command and noticed that the problem occurs at 480KB and below.
fsutil file createnew <filename.type> <size_bytes>
The English translation of the error message for the problem is as follows:
An unexpected error is preventing you from copying the file. If you continue to receive this error, you can use the error code to seek help with this issue:
Error 0x80070026: End of file reached.
When I connect to the same HDD via FTP, I can write files without any problems.
Thanks.
Ferhat
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Yes, I really need a solution as well. Right now when copying something to NAS I have to create zip-files for everything, then copy and extract it from the File Manager of Synology. Very time consuming!
Hello Richard,
Does the "xcopy" command work? I don't think that that command uses the troublesome CopyFileEx API.
Gary
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 14.000000000000002%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESW%3C/text%3E%3C/svg%3E)
Does the "xcopy" command work? I don't think that that command uses the troublesome CopyFileEx API.
No - I've just tried using XCopy and it doesn't work either.
Hello Simon,
Thanks for that quick feedback. I don't have the set-up (pre-mainstream release Windows version and old NAS) to test things.
If you know how to compile a C# program you could try compiling this code and checking whether that works.
using System;
using System.IO;
class A
{
static int Main(string[] args)
{
if (args.Length < 2) return -1;
try
{
File.WriteAllBytes(args[1], File.ReadAllBytes(args[0]));
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
return 0;
}
}
Update: one could try something similar directly from PowerShell:
[System.IO.File]::WriteAllBytes("D:\Folder.jpg", [System.IO.File]::ReadAllBytes("W:\Folder.jpg"))
Gary
Hi Gary - I understand the Microsoft have fixed this issue and it's only a question of waiting for the fix to reach users.
I
That would be nice. Awaiting the next Windows Update. I'm on Windows 11 version 22H2 22622.440 right now.
I was given the impression that Microsoft had fixed this - if so they are taking a very long time to roll it out.
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I just upgraded to the final version of Windows 22H2 and am running into this issue, so it is unfortunately still there. I will now roll back to the previous version.
Is there any workaround or do we really have to wait until there is a fix one day?
I just discovered that in the Release Preview Channel, there is now a Build 22621.521. I installed this Build and the problem appears to be resolved.