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|Magnetic Tape Drives|
Magnetic tapes are plastic tape coated with iron oxide for magnetic recording. A Magnetic tapes consists of the information storage medium on a plastic strip. Magnetic tapes are used for video, audio storage and other formats or used in general purpose data storage in a computer. The concept of Magnetic tape was first introduced by Fritz Pfleumer of Germany in 1928. At that time it was not used to record data but at the beginning of 1951. The recording medium was just 1/2 inch wide thin band of nickel-plated bronze. It has a very low recording density which was about 128 characters and a data rate of 12,800 characters per second.
In the early, the magnetic tape drives were mechanically used to create vaccum columns. Magnetic tape audio storage sequential storage medium was used for data collection and for backup. Many other types of equipment such as videotape, computer tape was made up of flexible plastic with one side coated with a ferromagnetic material.
The Magnetic Tape is more economical than disks, but changing of disk capacities have increased enormously. The Magnetic Tapes can be used to store the duration, they must be periodically recopied or the tightly coiled magnetic surfaces may contaminate each other.
The major drawback of Magnetic Tape is its sequential format which helps in locating a specific record or searching for markers that identifies partitions. Most of the Magnetic Tape used for archiving rather than routine updating, which allows some drives for rewriting in place if the byte count does not change. The Magnetic Tape can be used for updating files, copying files from the original tape to a blank tape and adding the new data in between the disk. Track Formats Tracks run parallel to the edge of the tape or it may run diagonally.
The Magnetic Tape opens the reel tapes which are being used for nine linear tracks while modern cartridges can be used for 128 or more tracks. Data are recorded in in a free space called an interrecord gap and the Magnetic Tape drive speed is measured in inches per second. The storage density of the Magnetic Tape can be increased from 200 to 38,000 bpi and compact tape.
The data is written to tape in blocks with inter block gaps between them, and helps in writing of the block in a single operation with the tape running continuously during the write. The rate at which data is written or read to the tape drive is not deterministic, the Magnetic Tape usually has the difficulty to cope with a rate at which data goes on and off the tape and the rate at which data is supplied.
The Magnetic Tape has a large memory buffer which can be used to queue the data. The tape drive can be stopped, backed up, and restarted. There is a complex difficulty between block size and the size of the data buffer in the record, the percentage of tape lost on inter-block gaps, and read/write throughput. The Magnetic Tape is quite and can be used to wind an average of 1/3 the tape length to move from one arbitrary data block to another. Most of the Magnetic Tape have intrinsic long latency which can be used for indexing, or maintaining a separate lookup table. Most The Magnetic Tape drives can now perform the data compression.
The Magnetic Tape remains a best alternative because of its higher bit density and lower cost per bit. The Magnetic Tape can offer disk storage to make it a reasonable good product.
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