The top coat (magnetic emulsion) of the tape is fed to the write-head. The wire wound around the write-head carries the electrical signature (current) of the sound to be recorded. The current-carrying wire induces a proportional magnetic field M. Fingas, Jon (4 May 2014). "Sony's 185TB data tape puts your hard drive to shame". Engadget. Archived from the original on 3 May 2014 . Retrieved 4 May 2014. Multiply this figure by its adhesive force per square centimetre. For example, 60cm² x 100g/ cm² = a maximum strength or pull force of 6,000g (6kg)

The top coat consists of a magnetic pigment held together by a binder to form an emulsion. The magnetic pigment consists of a ferromagnetic substance like ferrous oxide, chromium dioxide or pure iron. The pigment provides small magnetic domains that can be manipulated to create and store signals. The binder is a thermoplastic polymer like cellulose acetate or polyurethane, which has the magnetic pigment pigments embedded in it. The top coat is quite thin and ranges from 2um-13um in cross-sectional length. LTO-3, launched in 2004, added the write-once, read-many ( WORM) feature, which writes data to a tape one time and prevents its erasure. LTO-4 in 2007 provided data encryption. In 2010, LTO-5 added the Linear Tape File System, which provides for indexing and partitioning. All later LTO releases also include these features. Tape capacity continues to grow. The LTO Program has a defined schedule for upcoming releases, and it typically launches a new version every two to three years. Customers can count on that reliable product roadmap. Magnetic tape storage is also well-suited for archiving because of its durability, as it generally has a 30-year shelf life. Tapes are also easily movable, while disks are not as portable. In a disaster recovery scenario, as long as the tapes are far enough away from the affected data center, an organization can use them for restoration. When disk and its random access hit the market, it largely replaced tape for primary storage. Some industries, though, such as media and entertainment, as well as sciences and video surveillance, heavily use magnetic tape for storage, notably for its large capacity.A current is induced in the wire wound around the ring, which is proportional to the magnetization of tape. As the tape keeps moving, the tape guide on left side feeds the un-magnetized tape into the write-head and the magnetized part is received by the tape-guide on the right side.

The tape is now magnetized. The magnetization of the pigments is proportional to the external field M, which itself is a signature of the input current, which is a signature of the original input audio. Audio -> Electrical Signal (Current) -> Induced Magnetic Field M-> Magnetization of Tape A current-carrying wire produces a magnetic field around itself, with the field lines being closed circles. The lid of a rectangular box of sides \( 40 \mathrm{~cm} \) by \( 10 \mathrm{~cm} \) is sealed all round with tape. What is the length of the tape required?

As mentioned previously there are many ways in which to use magnet tape. For example, you could use magnet tape for securing: Modern magnetic tape storage traces its roots to the 1950s. When the first modern commercial computer, the UNIVAC I, was released in 1951, the inventors used magnetic tape to supplement the computer's storage, according to data storage vendor Iron Mountain.