Usually, when you plug your MP3 player into a PC, Windows automatically recognizes it. If you see the message "Unknown Device" your Windows PC does not recognize your MP3 player, so there could be device driver compatibility issues. This FAQ will walk...
Storing your music on an SD (secure digital) card can offer numerous advantages in terms of portability. For instance, many MP3 players, smartphones and tablets you might use in your business feature SD cards as a means of storage. When your music is on one of these cards, you can insert the SD card into the device and instantly have access to the songs you've downloaded onto it.
The Listen Up Player was released in 1996 by Audio Highway, an American company led by Nathan Schulhof. It could store up to an hour of music, but despite getting an award at CES 1997 only 25 copies were made. That same year AT&T developed the FlashPAC digital audio player which initially used AT&T Perceptual Audio Coder (PAC) for music compression, but in 1997 switched to AAC. At about the same time AT&T also developed an internal Web based music streaming service that had the ability to download music to FlashPAC. AAC and such music downloading services later formed the foundation for the Apple iPod and iTunes.
PMPs were earlier packaged with an installation CD/DVD that inserts device drivers (and for some players, software that is capable of seamlessly transferring files between the player and the computer). For later players, however, these are usually available online via the manufacturers' websites, or increasingly natively recognised by the operating system through Universal Mass Storage (UMS) or Media Transfer Protocol (MTP). 2b1af7f3a8