I/o device error when trying to use windows 7 backup to an external hard drive

I have a Windows 7 operating system.  The computer was running very slowly so I used the systems diagnostics at startup and received short DST failed with a failure id of 6C2NXD-53Q713-XD002J-60RL03 for the hard disk test,  the start up test, the
run-in test.  Each test showed memory test passed and smart check passed.  In researching the error it states that my hard drive is failing or perhaps some program is causing the error.  I tried removing some programs I thought may be the issue.
 Didn't work.
I have tried using the Windows 7 backup but the backup reached about 67% then states backup not completed i/o device error.  I am trying to back up my files to a brand new Toshiba USB 3.0 & 2.0 external hard drive with 1.0 TB/To.
I have gone to start then computer and it shows the device.  It also shows some files on it.  The backup fails when it it trying to do a system image as far as I can tell by reading the progress details.  The Toshiba device says that it is
working fine and is already formatted to NTFS.   
What else should I check or do?  My computer is also now popping up with a window telling me a backup is needed before the hard drive fails.  It pops up with this message at the same time I am trying to do the backup (the backup is already processing).
Thank  you

Hi,
Have you performed a disk check on your PC? More details, please check here:
How to Run Disk Check in Windows 7
Regarding the i/o device error, have you received any specific error IDs like
0x8007045D?
In addition, please also take a verify to see if the external disk is Advanced Format Disks(Some types may not compatible with Windows 7):
For example Run fsutil fsinfo ntfsinfo f:
 to check the
bytes per physical sector
of the external disk drive.
More information, please see:
An update that improves the compatibility of Windows 7 and Windows Server 2008 R2 with Advanced Format Disks is available
Hope this may help,
Best regards
Michael
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