Music is a protected form of artistic expression. To prevent buyers from making bootleg copies of CDs, some companies put software on their CDs that prevents them from being copied onto a computer. This is more often a problem with older CDs, since fewer people used digital music players years ago, and so there wasn't usually a legal reason to copy the contents of a CD onto a computer.
Although digital music files usually sound the same, there are several formats that they upload in. If you simply put the CD into your disc drive and follow the default prompts to rip it onto your computer, it may be copied onto your computer in a format that cannot be played on your portable device. To prevent this problem, open the program that you use in conjunction with your device and follow that program's prompts for ripping your CDs.
For a digital music file to be easy to find on a computer and on a portable music player, it should have certain information attached to it. Most important, it should have the song title, album title and artist name. Although this happens less with newer CDs, sometimes tracks will rip to a computer without any of this information. Instead, it will say, "Track 1," "Track 2," etc., and similar generic information for the artist and album. If this happens, you will have to complete the arduous task of typing in this information one field at a time. It's time-consuming, but it will be much easier to locate and play your songs later with the information attached to them.