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Write once read many. Write once read many (WORM) describes a data storage device in which information, once written, cannot be modified. This write protection affords the assurance that the data cannot be tampered with once it is written to the device, excluding the possibility of data loss from human error, computer bugs, or malware.
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]
XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.
Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use the same cell design, consisting of floating gate MOSFETs.
2400 Camino Ramon, Suite 375. San Ramon, California, U.S. Website. www.sdcard.org. The SD Association (SDA) is an American nonprofit organization that sets standards for the SD memory card format. SanDisk, Panasonic (Matsushita), and Toshiba formed the SD Association in January 2000. [1] In 2010, the SDA had approximately 1,000 member companies ...
Zoned Storage is a storage technology set that can reduces write amplification and product cost. It divide the storage device to many zones (usually the block of flash memory), and allow operating system (OS) to write data sequently on zones. It requires the modification of OS, and it needs the device (such as SSD) to support this feature.
Write blocking, a subset of write protection, is a technique used in computer forensics in order to maintain the integrity of data storage devices. By preventing all write operations to the device, e.g. a hard drive, it can be ensured that the device remains unaltered by data recovery methods.
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