CDs and DVDs get handled, their surfaces get scratched. Hard disks are protected better.
It is neither, CD DVD and hard disk is STORAGE not input or output.
no cuz i don't now i think
DVD and RAM are not permanent storage devices.
Data can be stored on floppy disk, hard disk, memory stick, CD or DVD.
Floppy Disk - 144 MB CD-R - 700 MB DVD-R - 4.7 GB Hard Disk - Up to 10 TB
Dvd+r
Usually much faster
It is a Hard Drive.
DVD-ROMCD-ROMExternal hard diskfloppy diskpen drive
CD, DVD, hard disk, sd card, floppy disk
Disc = DVD or CD or Hard disk?? If its a DVD or CD then the chances are it has been formatted incorrectly. If its a hard disk then it probably has not been partitioned correctly or the disk partition is damaged, or the drive has not been formatted correctly
Off course , this information stored on hard disk can be copied to any other storage device like hard disk, DVD, USB Drive etc.