Dbam Finished with non-fatal errors

[Drizz UK]

Hi,
I'm trying to run Dban on an Acer aspire laptop.
Everytime I run dban I get the following message after about 75% of the process.

DBAN finished with non-fatal errors.
This is usually caused by disks with bad sectors.
Send the log file with all support requests.

Hardware clock operation start date: Wed Aug 23 18:46
Hardware clock operation finish daet: Wed Aug 23 20:00

now I would supply the log file but how would I get it of the laptop?

Is this normal, if not how is the best way to fix this issue?

Many thanks.