Simple question about Dell Factory Image Restore

Hi,

I've posted tis both to 'hard drives' and 'operating systems' as I'm not sure which is best...

I'm fairly good with computers, but I'd just like to double check something before potentially deleting everything I have no backup of -

I've got a Studio 17, and it shows 3 hard drives : C: OS , D: DATAPART1 and E: RECOVERY

Since it's a laptop, I'm not sure if C and D are the same drive, or one partitioned drive (or if that's even relevant). C is shown as 222 GB, D at 232 GB and E at 4 GB (so E is a partition probably of C).

My computer's been bugging about more and more lately - it's still usable for most things, just 'annoying' sometimes. I've tried looking up on google the various problems, and ended up deciding that restoring it would be simpler, and solve everything. 

But, restoring it deletes all the files. And I've got no backup of most of it.  I put everything I want to keep on the D drive, "Datapart1" as it was called when new, I haven't changed that.

My qestion is very simple, anybody who has already used Dell Factory Image Restore on a PC with more than one drive will instantly know the answer, but to save potentially deleting everything I want to keep, when I restore it, will it delete all files just on the C drive, or on both drives ?

I know Acer's restore tool only deletes things from the C drive, as I've used that on a 2-disk PC before, and everything on D was still there afterwards, but having not yet used Dell's one I'd just like to double check if it deletes only from C or from both.

Thanks,

Dan