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[iambigred]

I have a number of files that I copied onto my DNS-320 from my office computer that have become corrupt after copying onto the DNS-320.  I have tried performing a MD5 hash of the some of the original files and the resulting MD5 hash is different to the original.  These are mainly video files that will now no longer play in any media player I have tried (VLC, WMP, mplayer, LG TV).

Thankfully this data is not critical and some of the files I still have stored on my office computer, but has anyone else experienced such data corruption?  Can anyone suggest an application to perform a hex comparison of large 1gb+ files to see how corrupted the files are?

Thanks

[iambigred]

Sorry, forgot to mention that I'm running the latest version of the firmware available on the dlink website (2.02).

[herbs]

No there is a fault, ive tried free filesync, create synchronicity and a few others and none of them pass with the dns 320. Generally any files over 4GB and few others don't seem to work.
I mentioned this sometime ago but it seems to be forgotten or disregarded. If you look at the files are they corrupted? as the ones I checked are fine just different crc results. Which means any incrementaly backs up have to keep rewriting the files/folders.

[iambigred]

The files are mostly high-bitrate video files, I think mostly over 4GB although some <1GB.  The files simply refuse to play in media players.

Is D-Link doing anything about this?  Surely this should be critical bug?  I usually use TeraCopy to copy large files but also Windows Explorer, both did not show any errors during moving/copying. I'll ensure I turn on verify mode in TeraCopy next time I attempt to copy anything onto the drive.

[JavaLawyer]

Have any additional DNS-320 users experienced this issue? If so, I'll add this as a bug on the DNS-320 Firmware Wishlist.

[ECF]

Yes, Teracopy is showing some strange results and it looks as if there is some problem with the Teracopy tool. When this issue was first submitted on the forum with the beta firmware I had it investigated by the engineers with files copied to the DNS-320 to check for corruption and they have verified that there was not problem. I reported that I too was seeing the issue when using Teracopy and it was confirmed that the CRC check fails was happening when using the Teracopy tool and not when doing a simple copy/paste of the same files

[JavaLawyer]

Thank you for the follow-up and clarification.

[iambigred]

Looks like this may be an issue with Teracopy then.  I'll use Windows Explorer to copy files and post back if I have any further issues. Thanks.

[JavaLawyer]

Looks like this may be an issue with Teracopy then.  I'll use Windows Explorer to copy files and post back if I have any further issues. Thanks.

I highly recommend using Syncback. The application is available at no cost for personal use.

[fritsimeel]

If its only files bigger then 4 gb, check if your drives are fat32 formatted. If so, format them to ntfs. fat32 is only capable of saving files smaller then 4 gb.
check: http://en.wikipedia.org/wiki/Fat32#FAT32
p.s. formatting erases your files........back them up before formatting to ntfs.

[herbs]

If its only files bigger then 4 gb, check if your drives are fat32 formatted. If so, format them to ntfs. fat32 is only capable of saving files smaller then 4 gb.
check: http://en.wikipedia.org/wiki/Fat32#FAT32
p.s. formatting erases your files........back them up before formatting to ntfs.

The disks are inside dns 320 not an external drive so they are formatted by the dns to ext3 I believe. I thank you for your input, and any attempt to fix it is welcome. It is mainly over 4Gb files but not always. It's just too unreliable to use, sort of defeats the purpose of a backup.

[JavaLawyer]

If its only files bigger then 4 gb, check if your drives are fat32 formatted. If so, format them to ntfs. fat32 is only capable of saving files smaller then 4 gb.
check: http://en.wikipedia.org/wiki/Fat32#FAT32
p.s. formatting erases your files........back them up before formatting to ntfs.

The disks are inside dns 320 not an external drive so they are formatted by the dns to ext3 I believe. I thank you for your input, and any attempt to fix it is welcome. It is mainly over 4Gb files but not always. It's just too unreliable to use, sort of defeats the purpose of a backup.

Correct. The DNS-320 formats HDDs using the Linux file system as ext3. The DNS-320 does not support internally mounted Fat32 HDDs.