[Solved] Windows 7 backup to 3TB Seagate external drive got 0x8078002A error

I’m using the Windows 7 backup and restore utility to create a system image and personal file backup to an external Seagate GoFlex 3TB disk. I got the following error:

One of the backup files could not be created.
Details: The request could not be performed because of an I/O device error.
Error code: 0x8078002A

I searched all over the internet and found these two related discussions (discussion 1 and discussion 2). Note the 1st discussion is for a Western Digital drive, which seem to have a solution with the WD Quick Formatter tool. But I downloaded that software and it cannot detect my Seagate drive. The 2nd discussion is directly relevant but it does not offer a solution. I’ve spent days on this and am at a loss…

Please help if you know what to do to make it work! Thank you!

Enquirer: Zhang18


Solution #1:

Here is the official answer from Seagate support. Hopefully this sheds some light. One word of caution. There are various online complaints about DiscWizard and my experience with it hasn’t been very good either (eg. backup has to be on an entire drive/partition, instead of some folder; the included DriveCleanser doesn’t actually do anything).

Thank you for contacting Seagate Support. I am sorry for any
inconvenience but Windows Backup does not support 4K sectors. All hard
drives now use 4K sectors. You will need to use an older model
external hard drive or a different image backup program. Seagate has a
program from Acronis called DiscWizard that works on 4K sector hard

Here is a link for the software:


For additional assistance, feel free to contact us at:

Respondent: Zhang18

Solution #2:

I just ran into the same problem with a WD drive… so here’s a summary for everyone else who googles this page:

The “root cause” is that Windows 7 (and its system tools) does not support a 4K native block size. As a workaround the disk can be formatted with “Advanced Format”/512E to use 512K blocks. KB article 2510009 describes the current support policy and how to check your disk.

After formatting with Windows’ Disk Management tool I ended up with a 4K disk layout which did not work for Windows Backup. — Using the WD Quick Formatter I could reformat the disk to a 512E layout and it works now. Other vendors should provide similar tools.

Respondent: mschuett

The answers/resolutions are collected from stackoverflow, are licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 .

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