DVD Storage Capacity
Unless you plan to include computer files on your DVD, as we'll discuss in Chapter 20, "Creating DVDs with iDVD," the best way to think of DVD storage capacity with iDVD is in terms of how many minutes of video you can fit on the disc. The amount of video you can fit on a disc is determined by how much the video is compressed. Because iDVD does the encoding automatically, the limit is about 90 minutes of video on the disc.
If you're talking about the disc in terms of bytes and megabytes, however, you might be familiar with the often-quoted measurement of 4.7 gigabytes (GB) ”that is, the claim that you can store up to 4.7 gigabytes of data on a
This is only partially true. If you were
But regardless of how you look at it, DVD is an incredible medium. The CD format typically allows only 650MB of data on a disc, whereas the DVD format enables you to put up to 4,370MB on a disc! To put this in perspective, consider that many computers you see on the
Figure 18.23. The relative
Purchasing the Right Blank DVD Discs
But if you want to get blank DVDS on your own, make sure that you're purchasing DVD-R General media. If the product packaging or salesperson says that the disc is DVD-R but there's no indication of whether or not it's General,
Another thing to look out for if you're shopping for blank discs is that you're purchasing DVD-R (minus R) media and not DVD+R (plus R) or DVD+RW (plus RW) discs. The plus discs are designed for other kinds of DVD burners.
To get a better sense of things, glance through Table 18.2, which gives a good indication of the situation consumers face as a result of the Format Wars. (It's
Table 18.2. DVD Recordable Media