A memory card is an electronic data storage device. It is used for storing digital information by using flash memory. These memory cards are commonly used in digital portable electronic devices. Generally, memory card comes with different types like camera card, compact flash card, multimedia card etc. A memory card is uses a lot by people in 1990s decade. There is no newer technology was available so memory card is uses to store or transfer the data. In old times, video game consoles have a memory cards to hold the saved data of games to run on the computer or T.V.
Capacity Of Memory Card
SDHC
The SDHC is for Secure digital high capacity format. It is announced in January 2006 and defined in version 2.0. Generally, SD specification, supports cards with capacities up to 32 GB. SDHC cards are physically and electrically identical to standard capacity cards. Generally SDHC cards are ship in preformat with the FAT32 file system. A version 2.0 is a really high speed bus mode for both SDSC and SDHC cards which produces 25MB/s. SDHC host devices are requires to accept older SD cards.
SDXC
The SDXC is for secure digital extend capacity format. It is announced in January 2009. Generally it has a version 3.01 of SD specification. This cards supports up to 2TB. SDXC uses microsoft’s exFAT file system as a mandatory feature. Generally, This version 3.01 also introduced the Ultra high speed bus which supports both cards. Version 4.0 out in June 2011 which allows speeds of 156 MB/s to 312 MB/s over the four lane. After that version 5.0 out in February 2016 which supports higher resolutions video formats like 8K video quality. The minimal write speed of this cards is 90MB/s.
SDUC
Generally, SDUC is for Digital Ultra capacity format. It is describes in the SD 7.0 specification and out in June 2018. Comparatively this card supports up to 128TB. It offers a speed up to 985MB/s to write the data. It uses SD express interface which also can be uses with SDHC and SDXC cards.
Features
Write protect notch
“mechanical write protect switch” allows the user to advice the host that user wants to be treats read only. Generally this does not protect the data on card if the host is compromised. To protect the card the whole responsibility goes to the host. In some case some host devices do not support write protection. It is optional feature of the specification. A miniSD as well as microSD formats do not directly support a write protection notch. Generally. If we look SD card from top it must be notch from right side.
Card password
“mechanical write protect switch” allows the user to advice the host that user wants to be treats read only. Generally this does not protect the data on card if the host is compromised. To protect the card the whole responsibility goes to the host. In some case some host devices do not support write protection. It is optional feature of the specification. Comparatively, A miniSD and microSD formats do not directly support a write protection notch. Generally. If we look SD card from top it must be notch from right side.
Smart SD cards
A smart SD memory card is a microSD card. which comes with an internal “secure element” that allows the transfer of ISO app protocol data Unit. Some of the earliest versions of microSD cards comes with secure elements which develops in 2009 by devicefidelity Inc. devicefidelity also adapted the In2pay microSD to work with Apple’s iPhone. Finally It makes the first NFC transaction and mobile payments on apple device in 2010.
SDIO cards
A SDIO stands for “secure digital input output”. This card is a extension of the SD specification of I/O functions. SDIO cards are fully supports the functional in host devices designs to support there I/O functions. These device used the SD slot to supports a lot of devices like GPS receiver, RFID readers, FM radio tuners etc. SDIO cards supports all commands of SD cards. Typically this SDIO card uses this capability to structure itself as one I/O card.
Ganging cards together
This ganging card uses open collector interface where card pulls a line at low voltage level. The cards shared clock and signal lines, where each card has its own chip. Generally, This protocol has ability to gang 30 cards together. In practice, cards are rarely gang together because open collector operation have problems at high speed and increases power consumption.
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