Secure Digital, officially abbreviated as SD, is a proprietary non-volatile flash memory SD card format developed by the SD Association for use in portable devices.
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17 Facts About SD card
2.
The SD card was derived from the MultiMediaCard and provided digital rights management based on the Secure Digital Music Initiative standard and for the time, a high memory density.
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3.
The SD card's small footprint is an ideal storage medium for smaller, thinner, and more portable electronic devices.
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4.
Second-generation Secure Digital SD card was developed to improve on the MultiMediaCard standard, which continued to evolve, but in a different direction.
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5.
SD card speed is customarily rated by its sequential read or write speed.
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6.
In 2014, a blogger measured a 300-fold performance difference on small writes; this time, the best SD card in this category was a class 4 SD card.
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7.
An SD card inserted into the phone underneath the battery compartment becomes locked "to the phone with an automatically generated key" so that "the SD card cannot be read by another phone, device, or PC".
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8.
MicroSD card has helped propel the smartphone market by giving both manufacturers and consumers greater flexibility and freedom.
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9.
The usage of a memory SD card protects the mobile phone's non-replaceable internal storage from weardown from heavy applications such as excessive camera usage and portable FTP server hosting over WiFi Direct.
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10.
Since late 2009, newer Apple computers with installed SD card readers have been able to boot in macOS from SD storage devices, when properly formatted to Mac OS Extended file format and the default partition table set to GUID Partition Table.
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11.
Once the host device and the SD card negotiate a bus interface mode, the usage of the numbered pins is the same for all card sizes.
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12.
Physical interface comprises 9 pins, except that the miniSD card adds two unconnected pins in the center and the microSD card omits one of the two VSS pins.
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13.
The SD card can be reformatted to use any file system the operating system supports.
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14.
Such an SD card can be write-locked to preserve the system's integrity.
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15.
SD Standard allows usage of only the above-mentioned Microsoft FAT file systems and any SD card produced in the market shall be preloaded with the related standard file system upon its delivery to the market.
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16.
Desktop SD card readers are themselves embedded systems; their manufacturers have usually paid the SDA for complete access to the SD specifications.
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17.
Malfunctioning SD card can be repaired using specialized equipment, as long as the middle part, containing the flash storage, is not physically damaged.
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