Write protection
Write protection is the physical mechanism that prevents modification or deletion of valuable data on the device. Sold most commercial software, audio and video before protected.
Examples [edit]
IBM tape reels 1/2, introduced in 1950, was not in the ring side of the coil, which should be soft plastic ring placed in the system from writing to slot of the tape. ("Do not ring, do not write.")
Audio tapes and VHS videos have tabs at the top edge / yield which can be broken (= foreign EBAY).
Can 8 and 5 ¼ inch disks have, respectively, write-protected and write enable cracks on the right side (8 "hole = protected; 5¼" Indoor / absent notch = protected). It is common practice with one disc to dig in front of second-class on the other side of the disc to allow the use of both sides of the media, create Felipe tablet, originally named because it was necessary to convert the disk using the other hand.
3 ½ inch floppy disks with a sliding window in a tab on the right mark (open = protected).
Iomega Zip drives and disks write-protected using IomegaWare program.
The Syquest EZ drive protected discs (135 and 250 MB) on the back by a small metal disc at the bottom key.
8mm, HI8, DV videos have a sliding tab on the trailing edge.
The tape cartridges Iomega Ditto small slip on the top left corner on the front of the cartridge tab.
USB flash drives sometimes shift slightly, despite the fact that this has become rare. An example of a USB flash drive supports write protection by switching series is exceeded JetFlash.
Secure Digital (SD) cards have protect tab on the left side.
These mechanisms were designed to prevent the loss of data or only from computer viruses attacks. And a particular user can easily avoid or cover up notch with the band or create one with a blow to his case, or in some cases by the physical change of the modes of transport to ignore the protection mechanism of writing.
And it is performed usually write protection by hardware. In the case of computer peripherals, in an attempt to violate the error in the operating system, while some recorders physically block the record button when the bar is protected against writing now.
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