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  2. Disk formatting - Wikipedia

    en.wikipedia.org/wiki/Disk_formatting

    Formatting a disk for use by an operating system and its applications typically involves three different processes. [e]Low-level formatting (i.e., closest to the hardware) marks the surfaces of the disks with markers indicating the start of a recording block (typically today called sector markers) and other information like block CRC to be used later, in normal operations, by the disk ...

  3. Write protection - Wikipedia

    en.wikipedia.org/wiki/Write_protection

    An example of a USB flash drive that supported write protection via a switch is the Transcend JetFlash series. Secure Digital (SD) cards have a write-protect tab on the left side. Extensively, media that, by means of design, can't operate outside from this mode: CD-R, DVD-R, Vinyl records, etc.

  4. Write once read many - Wikipedia

    en.wikipedia.org/wiki/Write_once_read_many

    To the user, the disc appears to allow additions and revisions until all the disk space is used. The SD card and microSD card spec allows for multiple forms of write-protection. The most common form, only available when using a full-size SD card, provides a physical write protection switch which allows the user to advise the host card reader to ...

  5. Floppy disk - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk

    The head gap of an 80‑track high-density (1.2 MB in the MFM format) 5¼‑inch drive (a.k.a. Mini diskette, Mini disk, or Minifloppy) is smaller than that of a 40‑track double-density (360 KB if double-sided) drive but can also format, read and write 40‑track disks provided the controller supports double stepping or has a switch to do so ...

  6. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    The switch is a sliding tab that covers a notch in the card. The miniSD and microSD formats do not directly support a write protection notch, but they can be inserted into full-size adapters which do. [citation needed] When looking at the SD card from the top, the right side (the side with the beveled corner) must be notched. [citation needed]

  7. Gutmann method - Wikipedia

    en.wikipedia.org/wiki/Gutmann_method

    The Gutmann method is an algorithm for securely erasing the contents of computer hard disk drives, such as files.Devised by Peter Gutmann and Colin Plumb and presented in the paper Secure Deletion of Data from Magnetic and Solid-State Memory in July 1996, it involved writing a series of 35 patterns over the region to be erased.

  8. Comparison of memory cards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_memory_cards

    This particular example shows the write protect sticker (the silver disc). Memory Stick: Sony, SanDisk: Standard 1998 128 MB Slim and narrow (50 mm × 21.5 mm × 2.8 mm), optional DRM, up to 128 MB PRO 2003 4 GB (not to scale) Slim and narrow (50 mm × 21.5 mm × 2.8 mm), swifter, optional DRM, up to 4 GB Duo 2003 128 MB

  9. Data erasure - Wikipedia

    en.wikipedia.org/wiki/Data_erasure

    Data erasure tools can also target specific data on a disk for routine erasure, providing a hacking protection method that is less time-consuming than software encryption. Hardware / firmware encryption built into the drive itself or integrated controllers is a popular solution with no degradation in performance at all.