We need to backup the whole DVD, CD, Blu-ray disk on hard disk before returning them back to friend (real owner), in that case use DVD backup software to create virtual image of the disk. Virtual Image is something like having the copy of the DVD/CD/Blu-ray disk on hard disk and then insert that virtual disk in virtual drive on PC. That means actually the backup data whether movies, software, music plays from the hard disk. As today we have huge hard disk like 500GB to 1TB, we can have so many virtual images properly stored.
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There are lot many application freely available to create such virtual image of the disk. ImgBurn is such a free software to create virtual images from the disk like CD/DVD/Blu-ray. It has read, write, build, verify, discovery modes to perform different tasks like reading disk, writing content of physical disks into virtual disk by burning that etc.
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Once you will have virtual disks for all important disks, you don’t need to look into your DVD collections to watch old movies etc. Virtual images works similar to the normal disks and you will feel same way like inserting a physical disk into a physical drive. There are so many formats of virtual images. For example, .iso, .mds, .b5t, .b6t, .isz, .ccd, .bwt etc. By using ImgBurn, you can create images in ISO format.
Start taking backup of DVD or other disks on Hard Disk using backup software, and feel safe about them.