Double reef knot. Travel Tips

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Double reef knot. Travel Tips

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Sometimes double reef knot is called a file knot. But sailors almost never use it: for a temporary bunch of pins and other ends, they have enough reef knot.

In the dictionary of Vladimir Dahl, it is called "loop knot" and "burdock (bow)". Often it is also called a byte node. It is knitted in the same way as a straight knot, but in the second half-knot, the running ends of the cable are tied doubled.

Rice. 95. Double reef knot

It is an indispensable knot for tying shoelaces, rope, bows around the neck and bows in the hair, as well as on bundles and boxes.

Author: Skryagin L.N.

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New tape density record 22.12.2020

IBM Research specialists announced a new record density record data on magnetic tape - 317 gigabits per square inch. This is 27 times the performance of current LTO cartridges and is the sixth record in this area set by IBM Research since 2006.

Tape storage technology was developed over 60 years ago and has traditionally been used for archiving and backing up data. It was then that IBM released its first commercial product. At that time, the capacity of the 726 Magnetic Tape Unit with a half-inch wide magnetic tape was about 2 MB. Since then, tape has remained the most reliable, energy-efficient, and cost-effective way to store vast amounts of archive and backup data.

The previous record, set in 2017, was beaten using a prototype strontium ferrite (SrFe) tape developed in collaboration with Fujifilm. The best cartridges currently available on the market use a tape with a barium ferrite (BaFe) magnetic layer. And, as noted above, the development of IBM and Fujifilm exceeds them in terms of recording density by 27 times. Potentially a new record corresponds to the possibility of producing 580 TB cartridges (not including compression) that fit in the palm of your hand. For comparison, an LTO-8 cartridge with a new 580 TB tape is equivalent to 786 CDs - if stacked, the height of the structure would reach 977 meters

In addition to the aforementioned magnetic tape with a magnetic layer of strontium ferrite, there are other innovative solutions that have played a role in achieving this result. The complex of improved technologies for controlling the servo-mechanical part of the drive and the head ensured the positioning accuracy of the head relative to a tape moving at a speed of 15 km/h of at least 3,2 nm, which is only one and a half times the width of the DNA molecule.

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