Secure Digital, officially abbreviated as SD, is a proprietary non-volatile flash memory MicroSD card format developed by the SD Association for use in portable devices.
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18 Facts About MicroSD card
2.
The MicroSD 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 MicroSD 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 MicroSD card was developed to improve on the MultiMediaCard standard, which continued to evolve, but in a different direction.
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5.
SD MicroSD 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 MicroSD card in this category was a class 4 MicroSD card.
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7.
An SD MicroSD card inserted into the phone underneath the battery compartment becomes locked "to the phone with an automatically generated key" so that "the SD MicroSD card cannot be read by another phone, device, or PC".
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8.
SmartSD memory card is a microSD card with an internal "secure element" that allows the transfer of ISO 7816 Application Protocol Data Unit commands to, for example, JavaCard applets running on the internal secure element through the SD bus.
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9.
MicroSD card has helped propel the smartphone market by giving both manufacturers and consumers greater flexibility and freedom.
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10.
The usage of a memory MicroSD 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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11.
Since late 2009, newer Apple computers with installed SD MicroSD 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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12.
Once the host device and the SD MicroSD card negotiate a bus interface mode, the usage of the numbered pins is the same for all MicroSD card sizes.
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13.
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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14.
The MicroSD card can be reformatted to use any file system the operating system supports.
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15.
Such an SD MicroSD card can be write-locked to preserve the system's integrity.
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16.
SD Standard allows usage of only the above-mentioned Microsoft FAT file systems and any MicroSD card produced in the market shall be preloaded with the related standard file system upon its delivery to the market.
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17.
Desktop MicroSD card readers are themselves embedded systems; their manufacturers have usually paid the SDA for complete access to the SD specifications.
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18.
Malfunctioning SD MicroSD 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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