Write protection
（重定向自Write protect notch）
![IBM tape reel with white write ring in place, and an extra yellow ring.](/Images/godic/202502/21/Write_protect_ring.agr0049.jpg")
![From top to bottom: an unprotected Type I cassette, an unprotected Type II, an unprotected Type IV, and a protected Type IV.](/Images/godic/202502/21/Cassette_Write_Protect_IV0049.jpg")
![A sheet of 5-1/4](/Images/godic/202502/21/Floppy_tabs_3x20049.jpg")
Write protection is any physical mechanism that prevents modification or erasure of valuable data on a device. Most commercial software, audio and video is sold pre-protected.
Write protect notch
英语百科
- backman tower
- back margin
- back mark
- backmarker
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- backmasked
- Backmasking
- Back Masking
- backmatter
- back matter
- back measurement
- backmen
- back mesurement
- back metal
- Back method
- back microbevel
- back migration
- backmigration
- back mill table
- back mirror
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- Backmix
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- backmixflow reactor