2013年9月3日星期二

What is a drum

Drum is used as an internal memory. Of aluminum drum, the drum is coated magnetic material to store data. Drum rotation speed is high, so the access speed. It uses the saturation magnetic recording head from fixed to floating head development, from the use of magnetic glue developed to continuous magnetic media by electroplating. These are Drawer Magnet later laid the foundation for disk storage.
   The biggest drawback is the drum utilization is not high, only the surface layer of a large cylinder for storage, use both sides of the disk to store, apparently utilization is much higher. Therefore, when the disk appears, the drum was eliminated.
   Drum is a key component of the camera, and its performance has a direct impact on the quality records, so use should be doubly care to prolong its life.

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