Tape Data Recovery - Quarter-Inch Cartridge
Quarter inch cartridge (QIC) tape is a magnetic tape data storage format introduced by 3M Company in 1972. Originally, the tape was ¼ -inch (6.35 mm) wide and had a length anywhere between 300 feet and 1,500 feet. Data is written to the tape in linear tracks, in a specific [...]
Tape Data Recovery - Shoe-Shining Effect
Shoe-shining effect is a condition which occurs when the data transfer rate to a magnetic tape falls below the minimum capacity at which the tape drive heads are designed to transfer data to a running tape.
The shoe-shining effect significantly affects the attainable data rate. This is not desirable in data [...]
Tape Data Recovery - DECtape
DECtape was a type of magnetic tape data storage medium used in many versions of Digital Equipment Corporation computers, including several PDP models and LINC-8. DECtapes were designed to be reliable and durable and was used as the main storage medium for an operating system. The DECtape drive was able to [...]
Tape Data Recovery - Tape Mark (End-of-file)
In computing, tape mark refers to a special character or coding or a piece of reflective material or other devices attached to the physical end of a magnetic tape. Tape mark denotes the end of the file, after which no data can be read from the tape without rewinding [...]
Tape Data Recovery - IBM 7 track
IBM 7 track tape was part of IBM’s first magnetic tape data storage devices introduced in 1952. The tape is ½-inch wide and consists of 7 tracks, 6 for data and one for maintaining parity. Data is stored as 6-bit characters.
Important Features
IBM 7 track tape had initial recording density [...]
Tape Data Recovery - IBM 729
The IBM 729 Magnetic Tape Unit was part of IBM 7 track family of tape units. They were the popular tape mass storage system used by IBM from the late 1950s through the mid 1960s.
Architecture
IBM 729 used ½-inch magnetic tape up to 2400 feet long, wound on reels with diameter [...]
Tape Data Recovery - IBM 727 Magnetic Tape Unit
IBM 727 Magnetic Tape Unit was the standard tape drive for the earlier vacuum tube era computers of IBM. It was first introduced in the IBM 701 and IBM702 in 1953. Later IBM introduced IBM 729 series tape drives, which were used for both vacuum tube machines [...]
Tape Data Recovery - PET Film
Biaxially-oriented polyethylene terephthalate (boPET) is a polyester film originally developed by DuPont and Imperial Chemical Industries. Several companies now manufacture boPET and other polyester films under different brand names. The most popular brands in the Western markets are Mylar and Melinex.
BoPET films have high tensile strength, as well as chemical [...]
Tape Data Recovery - UNIVAC I
UNIVAC I stands for the Universal Automatic Computer I invented by J. Presper Eckert and John Mauchly. UNIVAC I was the first commercial computer manufactured in the United States. They were built by Remington Rand’s UNIVAC-division.
Features
UNIVAC I used 5,200 vacuum tubes and consumed 125 kW. The computer could perform about [...]
Tape Data Recovery - Reel
A reel is usually a cylindrical core around which a storage medium such as a tape is wound. The reel is supported by walls on the sides to retain the tape wound around the core. The core can be hollow or solid. In some devices, core is provided with grips to [...]
