magnetic tapes - ορισμός. Τι είναι το magnetic tapes
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Τι (ποιος) είναι magnetic tapes - ορισμός

MEDIUM USED TO STORE DATA IN THE FORM OF MAGNETIC FIELDS
Magnetic Tape; Magnetic tapes; Streaming tape; Magnetic tape drive; 7-track; Oxide side; Recording tape; Magtape; Analog tape; Quarter-inch magnetic tape; Mag tape; Tape leader; Magnetizable coating; Magnetic coating; Magnetophone tape; Magnetophon tape; Leader tape; Magnetized tape strip; Analog tape recording
  • [[Compact Cassette]]
  • Small open reel of [[9-track tape]]
  • A [[VHS]] helical scan head drum. Helical and transverse scans made it possible to increase the data bandwidth to the necessary point for recording video on tapes, and not just audio.

magnetic tape         
<storage> (Or "magtape", "tape" - paper tape is now obsolete) A data storage medium consisting of a magnetisable oxide coating on a thin plastic strip, commonly used for backup and archiving. Early industry-standard magnetic tape was half an inch wide and wound on removable reels 10.5 inches in diameter. Different lengths were available with 2400 feet and 4800 feet being common. DECtape was a variation on this "{round tape}". In modern magnetic tape systems the reels are much smaller and are fixed inside a cartridge to protect the tape and for ease of handling ("square tape" - though it's really rectangular). Cartridge formats include QIC, DAT, and Exabyte. Tape is read and written on a tape drive (or "deck") which winds the tape from one reel to the other causing it to move past a read/write head. Early tape had seven parallel tracks of data along the length of the tape allowing six bit characters plus parity written across the tape. A typical recording density was 556 characters per inch. The tape had reflective marks near its end which signaled beginning of tape (BOT) and end of tape (EOT) to the hardware. Data is written to tape in blocks with inter-block gaps between them. Each block is typically written in a single operation with the tape running continuously during the write. The larger the block the larger the data buffer required in order to supply or receive the data written to or read from the tape. The smaller the block the more tape is wasted as inter-block gaps. Several logical records may be combined into one physical block to reduce wastage ("{blocked records}"). Finding a certain block on the tape generally involved reading sequentially from the beginning, in contrast to magnetic disks. Tape is not suitable for {random access}. The exception to this is that some systems allow tape marks to be written which can be detected while winding the tape forward or rewinding it at high speed. These are typically used to separate logical files on a tape. Most tape drives now include some kind of data compression. There are several algorithms which provide similar results: LZ (most), IDRC (Exabyte), ALDC (IBM, QIC) and DLZ1 (DLT). See also cut a tape, flap, Group Code Recording, spool, macrotape, microtape, {Non Return to Zero Inverted}, Phase Encoded. (1997-04-05)
magnetic tape         
(magnetic tapes)
Magnetic tape is plastic tape covered with iron oxide or a similar magnetic substance. It is used for recording sounds, film, or computer information.
= tape
N-VAR
magnetic tape         
¦ noun tape used in recording sound, pictures, or computer data.

Βικιπαίδεια

Magnetic tape

Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magnetic tape could with relative ease record and playback audio, visual, and binary computer data.

Magnetic tape, invented by Fritz Pfleumer, is a recording medium used for audio, video, and computer data storage. It is prone to disintegration and can suffer from sticky-shed syndrome, a deterioration that may render the tape unusable. Despite newer technologies emerging as alternatives, companies like Sony and IBM continue to advance tape capacity. Various formats of magnetic tape-based recorders exist for audio, video, and computer data storage. Magnetic tape was first used for computer data storage in 1951 in the UNIVAC I system. In 2014, Sony and IBM announced a breakthrough in magnetic-tape media with a capacity of 185 TB.

Magnetic tape revolutionized sound recording and reproduction and broadcasting. It allowed radio, which had always been broadcast live, to be recorded for later or repeated airing. Since the early 1950s, magnetic tape has been used with computers to store large quantities of data and is still used for backup purposes.

Magnetic tape begins to degrade after 10–20 years and therefore is not an ideal medium for long-term archival storage.

Παραδείγματα από το σώμα κειμένου για magnetic tapes
1. But those images are of lower quality than the originals stored on the missing magnetic tapes.
2. That was 15 times as much data as can fit on similar space on magnetic tapes considered the current industry standard, IBM spokesman Mike Ross said.
3. Sony Corp., which has factories in Miyagi making magnetic tapes and semiconductor lasers, said there was no impact from the quake on its facilities and no staff were injured.
4. San Francisco, May 16: IBM scientists have found a way to cram unprecedented amounts of information onto magnetic tapes in a breakthrough it heralded on Tuesday as a data–storing boon to businesses for years to come.
5. Sony Corp., which has factories in Miyagi making magnetic tapes and semiconductor lasers, said there was no impact from the earthquake on its facilities and no staff were injured.