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#1
Backing up to a hard drive and a DVD: big image size differences?
I've backed up Windows through the official Windows Backup tool (in the Control Panel) to a hard drive (actually, a second partition). It takes about 8-12 GB (don't remember correctly). Then, right after that, I chose to make a backup also on a DVD, and, surprisingly, one DVD was enough!
First of all, it's weird that it could fit into one DVD while if I tried to burn the files form the backup on the hard drive, I would need at least two. And then the second thing: the files on the DVD all take about 3.4 GB. I tried making an image of it though Alcohol 120, and the MDF file takes about 3.4 GB. ImgBurn couldn't make an image, because it's a multiple session DVD.
So why is there such a difference in size between system images backed up to the hard drive and a DVD? Can I trust a DVD?
By the way, I tried creating backup with Arconis True Image (I don't remember true name) and Norton Ghost 15 to a hard drive, and their images take about 3 GB. So if the real size of my system image is about 3 GB, then why did Windows backup on HDD take so much place?
It's Windows 7 Ultimate 32 bit, by the way.