A disk encryption software is used to encrypt all the data on a disk. Once a disk is encrypted, then unauthorized personnel cannot access the data storage in the disk.

Most computers come with disk copying software installed. The only problem is with the encryption systems that most DVD movies use. Decryption software such as Handbrake can strip this encryption and allow the disk to be copied.

Disk encryption protects the data on a hard drive from being read by someone that isn't authorized. Disk encryption works by converting the information on the drive to unreadable data.

That depends on encryption you are using. In any case OS creates partitions and formats it (or specialized software). Next if you have software encryption, than special driver is installed which either encrypted files or whole disk by intercepting read and write operations called by OS. If you have hardware encryption, then your whole hard drive is encrypted on hardware level. It means that hardware has extra steps before writing or reading information on hard drive.

"Yes, there is some data encryption software that is available for free. Some other data encryption software has a fee. Sometimes, you can find data encryption software that costs a fee after a free trial offer."