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Copied files a few times on same external hard disk: copies corruptedd
On an external USB drive, WD Elements, 4TB (Notebook Medion akoya P8614) some files obviously became corrupted after copying them on the same drive (the files are not copied from another drive, but may be such files can become corrupted also). There was not any error message displaying the copying to be failed. I copied the same archive (zip or rar) a few times to another folder and in the same folder on the same drive and some of the copies have a different check sum (the check sum also differs among the corrupted files, so corrupted files have different check sums, not the same wrong check sum) and WinRAR or other programs show an error message that a file or more are corrupted when I try to unzip some of the copies. The file size stayed the same of all of the copies.
When I plugged in the USB plug of that drive the first times the external drive was not shown, after a few times and waiting finally it was shown. And some time ago with another Notebook (same manufacturer) I had some kind of the same problem: when unzipping / downloading archives to (or on, I do not remember anymore at the moment) a 2,5 external 640 GB drive (A sometimes they were corrupted.
I checked the drives (the 640 GB one and the WD Elements, 4TB) with CrystalDiskMark and CrystalDiskInfo and checked the 640GB drive with HDtune (error scan, the long one, not the "Quick Scan", no errors found.
And I checked the WD Elements, 4TB drive with the extended test (lasting two days and about 12 hours) of Western Digital Data LifeGuard Diagnostics - DLGDIAG, so a program developed by / for WD, no errors found:
And with another older external hard disk, 1TB, some weeks ago I had problems also, the cable USB connection to the Notebook (the same with the P: drive) obviously got interrupted 2 times while copying, I don't know why. May be there is a connection to the cause for the problems above. I did not test my other drives with some copying processes, but may be that happens with all of my drive.
What might cause the corrupted files? And how could I correct it?
Last edited by Doki; 17 Aug 2015 at 08:35.