MP3-players are classified by type of drive. CD-players often drive in addition to the files and can play regular Audio-CD discs and audio files recorded on blank CDs at home. But because of the features of the device are often afraid to drive any sudden movements or strokes. At present, considered obsolete and out of production by almost all companies. It has a diameter of 12 cm, and the limit is 700 MB. Minidisc-Players were used as carriers of mini discs. Flash-players are used as carriers of sound files embedded or removable flash memory and have a memory capacity ranging from 128 MB to 64 GB. This type of players has no moving parts - they are considered to be reliable and durable. Some of them have built-in battery charging via USB data-cable. To record a sound file in the memory connected to the PC via USB-interface, and to date almost all the models support the use of USB Mass Storage you do not need any software. Many models have the ability to record sound coming from the radio or a microphone. Some players are equipped with a small screen and can play video. Low power consumption provides longer battery life without recharging. Players on the hard drive or HDD are used as carriers of hard disk drive. It is characterized by a large amount of memory than previous types - from 1.5 GB to 500 GB. This means that you can save tens of thousands of songs on one device. Such devices are generally more expensive than the flash players. They do not have ultra-compact and weighs about 150 grams. Typically, they are not recommended for usage during the active running, because hard disk may be damaged due to vibration. Currently, almost all models of players have built-in radio, as well as the ability to record sound from various sources - radio, line input or microphone. Many players have a built-in voice recorder, which allows you to record sound. Typically, the recording quality is low, suitable only for speech but not for music. There are also professional recorders, which are suitable for high-quality music recording with an external microphone. Some digital players have the function of FM-radio. Number of songs that can fit into the player, also depends on the quality of their sound - the better the recorded song, the more memory it occupies.
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