Magnetic StorageIn General... All m

Magnetic Storage
In General...
All magnetic storage works similarly. The write heads align fields of magnetic particles on the surface. The polarity of the field of particles will depend on whether a one or zero is being recorded. Then when the read head passes over that area, it registers a one or zero depending on the polarity of the area.

Tapes
One of the first types of magnetic storage was that of the tape. This uses magnetically coated ribbon, wrapped around two reels. There are two common forms of Magnetic Tape. Either reel-to-reel or cartridge. The cartridge type is pictured here, and usually has several hundred feet of magnetic tape, and is most often used in personal computers. A reel-to-reel system is much larger, maybe several thousand feet of tape, and is on large spools. They are usually used on large mainframes. You may recall seeing pictures of refrigerator sized computers with silver and black reels on the front, with a black ribbon extending between the two reels.. Those are tape drives, albeit large ones.

A tape drive is basically like a cassette tape player/recorder. It has two heads: one read, one write. As the tape passes the head, the data is read or written, as the case may be.

Tapes have the advantage of being inexpensive, and rather reliable. But they are slow, because they are sequential access devices. This means you must advance or rewind the tape to the position where the requested data starts, much as you must advance and rewind a cassette tape to locate a song. Tapes are also slow due to the nature of the media. While data transfer can be increased by increasing the speed of the tape, this can lead to two problems. One, the heads are more likely to miswrite due to not having enough time to align the polarities of the magnetic particles, or may misread due to the tape not being under the head long enough. The other problem has to due with the durability of the tape media itself: The faster the tape is started, pulled, and stopped, the more it will stretch. If the tape stretches too much, then it will render it unusable for data storage, and data loss may result.

Результаты (английский) 1:

Magnetic StorageIn General To ... All magnetic storage works similarly. The write heads align fields of magnetic particles on the surface. The polarity of the field of particles will depend on whether a one or zero is being recorded. Then when the read head passes over that area, it registers a one or zero depending on the polarity of the area.Tapes One of the first types of magnetic storage technology was that of the tape. This uses magnetically coated ribbon wrapped around two reels. There are two common forms of Magnetic Tape. Either reel to reel or cartridge. The cartridge type is pictured here, and usually has several hundred feet of magnetic tape, and is most often used in personal computers. A reel to reel system is much larger, maybe several thousand feet of tape, and is on large spools. They are usually used on large mainframes. You may recall seeing pictures of dubbed Zim Zum sized computers with silver and black reels on the front, with a black ribbon extending between the two reels and. .. Those are tape drives, albeit large ones.A tape drive is basically like a cassette tape player/recorder. It has two heads: one of read, write one. As the tape passes the head, the data is read or written, as the case may be.Tapes have the advantage of being inexpensive, and rather reliable. But they are slow, because they are sequential access devices. This means you must advance or rewind the tape to the position where the requested data starts, much as you must advance and rewind a cassette tape to locate a song. Tapes are also slow due to the nature of the media. While data transfer can be increased by increasing the speed of the tape, this can lead to two problems. One, the heads are more likely to miswrite due to not having enough time to align the polarities of the magnetic particles, or may misread due to the tape not being under the head long enough. The other problem has to due with the durability of the tape media itself: The faster the tape is started, stopped, and pulled it, the more it will stretch. If the tape stretches too much, then it will render it unusable for data storage, and data loss may result.

Результаты (английский) 3:

Magnetic Storage
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