The reels ( magnetic tape ) are run in machines called magnetic tape unit. The magnetic tape unit is used for both data input (reading) and output (recording).
It has a supply reel, a take-up reel, a read-write head and an erase head. The process for recording data with magnetic tape unit (drive ) is similar to audio tape or audio cassette recorders that most of you have in your home. The read-write heads are used to read and write data on the tape. Each head is a small electromagnet with minute gap between the poles.
Recording on the tape : In the recording or writing operation, the tape moves over the gaps between the poles and the electric pulses from the CPU ( Central Processing Unit ) flow through the write coils of the head causing the iron-oxide coating of the tape to be magnetized in certain pattern.
Reading from the tape : When the tape is being read, the magnetized pattern (created during recording process ) induces pulses of current in the read coil which input or feed data into the CPU. In case there is already some recorded data on the tape, a fresh data is written erasing previous by erase head.
The tape should move during the read and write process. The tape movement starts from supply reel and tape passes the read-write heads towards the take-up reel. Normally, tape moves at speeds up to 200 inches per second.
It has a supply reel, a take-up reel, a read-write head and an erase head. The process for recording data with magnetic tape unit (drive ) is similar to audio tape or audio cassette recorders that most of you have in your home. The read-write heads are used to read and write data on the tape. Each head is a small electromagnet with minute gap between the poles.
Recording on the tape : In the recording or writing operation, the tape moves over the gaps between the poles and the electric pulses from the CPU ( Central Processing Unit ) flow through the write coils of the head causing the iron-oxide coating of the tape to be magnetized in certain pattern.
Reading from the tape : When the tape is being read, the magnetized pattern (created during recording process ) induces pulses of current in the read coil which input or feed data into the CPU. In case there is already some recorded data on the tape, a fresh data is written erasing previous by erase head.
The tape should move during the read and write process. The tape movement starts from supply reel and tape passes the read-write heads towards the take-up reel. Normally, tape moves at speeds up to 200 inches per second.
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