backup
The IBM 9 PAC, or IBM 9-Track Magnetic Tape, was designed primarily for data storage and transfer in computing environments during the late 1970s and early 1980s. It utilized a 9-track magnetic tape format, which allowed for higher data density and improved reliability compared to earlier tape formats. The 9 PAC was commonly used for backup, archiving, and large-scale data processing in mainframe systems. It played a crucial role in the evolution of data storage solutions during that era.
Tape storage is primarily used for archival storage. The recording medium is a thin polyester tape between 0.38cm and 2.54cm wide, about .025mm thick and coated with magnetic particles. The tape is wound on wheels of various sizes. Data is recorded sequentially, one byte after the other, from the beginning of the tape to its end. Access times for tape storage are much slower than for floppy diskettes or hard disks.The following diagram shows how data is stored on the disk. The read/write head is comprised of several tracks, 9 tracks being very common. This means nine bits are recorded across the width of the tape simultaneously. Using nine tracks, one byte of data plus a parity bit is recorded at a time (vertically). Characters are grouped together to form a record (often called a block). Each record is separated from the next record by a blank inter-record gap (IBG). Each record is preceded by a header field. The IBG allows the software to position the tape for recording or playing at specific record numbers. Physical markers are used to indicate the ends of the tape, and may be metallic foil, clear plastic or software markers encoded on the tape. Software encoding uses BOT(beginning of tape) and EOT (end of tape) indicators. IRG=IBG
television video tape 9-331 ?
Berrenger's - 1985 Roll Tape 1-9 was released on: USA: 23 February 1985
8.9 on a measuring tape represents a measurement that is 8.9 units from the starting point, typically in inches or centimeters, depending on the tape's scale. It indicates a position slightly less than 9 units, specifically 9 units minus 0.1 units. On an imperial measuring tape, this would be just shy of the 9-inch mark, while on a metric tape, it would be 89 centimeters.
The closest is 5 and 9/16.
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Casette 9 Side A
9 and 7/8 is closest.
Lifeguard - 2012 Boat Rescue Mix Tape 2-9 was released on: USA: 27 March 2013
Hardcore Pawn - 2009 Dirty Tape 5-9 is rated/received certificates of: Australia:PG Netherlands:6 USA:TV-14
Storage Hunters - 2011 Sound the Alarm 3-9 was released on: USA: August 2013