I have a 550 DSLR. I simply want to store .mov files to a hard drive so the kids can keep them for years to come, and watch them on the TV. After burning .mov files to DVD, they do not play back on the TV. Why is this, and don't want this to happen after saving on hard drive.
closed as off topic by mattdm, Matt Grum, John Cavan♦, Mark Whitaker, MikeW Jan 26 at 0:16
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Approximately every DVD/CD is useless after 2-3 years. It depends on disk brand, as the way DVD/CD disks are managed (it's good to keep them on dark places, without moisture, well packed etc...).
On the other hand, you have HDD, which duration is approximately about 5-6 years, depending on brand. But there are lots of positive sides of HDD. You can arrange your photos as you wish: folders etc (remember DVD/CD are read-only after you burn it), you can delete photos/videos, you have lot more data on one place and so on....
Which HDD to buy? You can buy any external HDD drive, and backup pictures/videos from your original HDD located in your computer. In this way, you have your files on 2 HDD (external, and computer HDD), and if there something goes wrong with one of your HDD disks, your files are safe. You can change your hard-drives every 4 years, and you will prevent data loss in 90% of cases.
Before you Backup your pictures/videos, it is good to compress them using some compression program like winzip or winrar, to keep your external HDD usage memory low.