Windows -- Delayed Write Failed error

[Egan]

Hi

I get a yellow triangular icon with a black exclamation point with the
message -- Windows -- Delayed Write Failed. Windows was unable to save all
the data for the file \Device\HarddiskVolume2. The data has been lost. This
error may be caused by a failure of your computer hardware or network
connection. Please try to save this file elsewhere.

This happens each time I backed up successfully with Acronis True Image Home
11 and immediately turning off my IOMEGA 250 GB external hard drive.
Also this happens when I am not backing up if I copy data to or from the
external hard drive and this error message appears.

If I leave my IOMEGA external hard drive on and logout of Windows
administrator account and then immediately turning the external hard drive
then the same error message appears but with a white X with a red circular
icon.

Does anyone know what is wrong? How do I fix this error message?
Is there something wrong with my external hard drive?

I ran chkdsk on Drive C and IOMEGA external hard drive but found no errors.

Much help is appreciated.

Thanks

 

[sgopus]

Do not turn off your drive, shut down your pc first, then shut down your hd,
and power up, I'm assuming your doing a clone of your primary hd?

 

[Egan]

What do you mean by doing a clone of my primary hard drive?
Well the backup software just backs up the my entire hard drive into 2 GB
compressed files onto my IOMEGA external hard drive. Is this what I described
cloning my primary hard drive?

Much Help Is Appreciated.

Thanks