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Running Windows 7 SP1 64-bit.

  • C = SSD
  • D = internal HDD with docs on it.
  • E = external HDD partition 1 (2 TB)
  • F = external HDD partition 2 (2 TB)

I select Windows can choose which files to back up, and F: as the backup location.

There is enough space on F:

When I run backup, I receive an error:

Windows Backup failed with I/O error 0x8078002A

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    The error doesn't mention anything like "The backup completed but some files were skipped." – Steve Jul 31 '15 at 10:59
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Found this here:

Microsoft Image Backup in Windows 7 will not support Seagate 3TB and 4TB drives (along with most other external drives above 2.1TB). This article explains.

Microsoft Image Backup in Windows 7 will not support Seagate 3TB and 4TB drives (along with most other external drives above 2.1TB).

Microsoft only supports drives that are set up to use 512 byte blocks as destinations for image backups. These drives are compatible with all other Windows functionalities.

To allow 3TB and 4TB drives to work in older operating systems like Windows XP, these drives are configured using 4K byte blocks.

Microsoft has added support for 4K drives in Windows 8. See here for more information.

For more information about the limitations of Windows Backup and Restore, please contact Microsoft.

  • Hmm. I'm running Windws 7 64 bit and backing up to a 3TB Seagate drive (1 NTFS format partition) with no problems ... did you run the setup.exe that came with the drive? – DavidPostill Aug 2 '15 at 14:06
  • @DavidPostill: Okay. It didn't come with a setup, only a Cloud Backup setup program. – Steve Aug 4 '15 at 12:07
  • Hmm. My drive had the setup program on the drive itself together with Warranty.pdf and Autorun.inf. – DavidPostill Aug 4 '15 at 12:12

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