I'm guessing you're a complete novice at this.
If the data in NOT encrypted, just copy over.
But more likely you mean DVD movies, right? In that case, you must decrypt them, the precise term is DeCSS (content scrambling system). DVDShrink and DVDDecrypter are popular and will do the vast majority of commercially-pressed DVD-Video. A minority (mostly Sony, Columbia, et.al.) use ARccOS, Disney and couple others use RipGuard. If DVDShrink or DVDDecrypter throw an error, try the following:
RipIt4Me, DVDFabDecrypter, AnyDVD (payware). Just to emphasise, all except the last mentioned are FREE. Fab and AnyDVD are dependent on frequent updates to keep up with the latest protection schemes.
You can rip to a file folder or rip to ISO image (disc image). To play an ISO image, you must "mount" it on a virtual drive like DaemonTools.
You need not pay for multimedia player software. MediaPlayerClassic (an independent development of WMP6) can play DVDs without an external MPEG2 codec, as can VideoLan. VideoLan can also play a variety of other formats without any codecs external to itself, and can play partial files. Both are free.
For storage on an external drive, you have a few choices: Recompress them to something like XviD, which will reduce the file size to perhaps one-fourth previous size without too much loss of quality. AutoGK is easy to use and popular for recompressing to XviD. Or leave as DVD-Video. ISO images are convenient in that you have one single file rather than a folder full of files.
You can use ImgBurn to put an ISO image on DVD, it is most dependable and compliant for the purpose, whereas Nero, for example, is not (the reason is technical relating to positioning of IFOs and BUPs). On a side note, if you wish to fit a movie onto a single-layer DVDRecordable, DVDShrink is convenient. Also, if you had to resort to the stronger methods of decrypting, you can still open the ripped files in DVDShrink for compression if desired.
Tools mentioned above, along with guides, can be found here:
http://www.mrbass.org/
And here:
http://www.videohelp.com/
I strongly advise you to use freeware tools, they are superior to commercial equivalents, seriously. Good luck.
