You can partition the harddrive and erase only the used portion.
I partitioned my 160GB in two halves. Doing 1/2 a drive seems to take less than 1/3 the time. I assume it's because C:\ is on the outer edge where the transfer rate is faster.
If you mean that you deleted a Word document so that it went to the Recycle Bin and then used Erase Recycle Bin, the document should have been erased. You can use Windows Explorer > Search to check if any copies remain.
One caution though ... only the last copy sent to the Recycle Bin would...
They may just be the remnants of the folder & files of pseudorandom data created by Eraser in the overwriting process.
Are they all in the root directory? What are the filename extensions and other properties (size, creation date, etc.)?
Have you tried opening one?
Please consider that if the computer is your employer's property and they have not given you administrative rights, you probably shouldn't be installing software through the back door.
Depending on company policy and/or employment regulations in your jurisdiction, you may be exposing yourself...
"Unused space " is just that ... no files. This can be virgin disk space (never used since manufacture) or space formerly occupied by deleted files.
In reality, your deleted files remain in this unused space until they happen to be overwritten by another file. Running Erase unused space...
If you run Erase unused space on the drive in question, it will erase the portions of the previously deleted files that happen to be in unused space. The portions that have been overwritten by other files will not be erased but they will have been overwritten at least once.
The combination...
Your proposed method should be OK.
The USB flash only needs one pass. Multiple passes will probably offer no additional security.
Depending on the nature of the level of security you require, multiple passes may be desireable on the USB external hard drive.
Do you know if erasing "cluster tips" in Eraser is really erasing all of the cluster tip/file slack? Does it overwrite the RAM slack portion of incomplete sectors (seems impractical) or is it only overwriting the drive slack portion of incomplete clusters?
If it's just that you want a fresh start (rather than any worries of a forensic examination for the previous owners' records) just re-install your OS using the option to format the harddrive when asked during the installation process.
If you are using Windows XP, the step-by-step on screen...
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