Windows 7 Backup Fail

[Broadback]

I have a 3 TB disk which fails when attempting a Windows Backup. The failure message is "the last backup did not complete successfully". More information states " One of your backup files could not be created. Details: The request could not be performed because of an I/O  device error." Show details reads: "Backup time: 15/09/2013 09:23  Backup Location: Seagate Backup Plus Drive (I:)  Error Code: 0x8078002A."
I have attempted this a number of times with the same error. I re-formatted the disk (a stupid idea perhaps, it took over 24 hours) there were no problems it seems.
Any suggestions as to what the problem may be?

[Steve]

This may be the issue - http://superuser.com/questions/491922/windows-7-backup-to-3tb-seagate-external-drive-got-0x8078002a-error  although I'm not a Windows user so it's something I've not come across but it does sound plausible. There is no solution showing there apart from using backup software that supports 4K sectors.

[Broadback]

Thanks Steve, that exactly describes my problem. I now know my drive is not faulty. Cheers.