using sd card without using FAT

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bagavathi

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Hi friends,

without using FAT can we access the memory for store the data like eeprom?
 

Yes,

You can access the SD Card via SPI without using any file system.
 

Yes, its like a flash memory, but you need to read and write them sector-wise , that is when the sector size is 512 bytes then you need to read and write always blocks of 512 bytes.
 

Using a file system will allow you to insert that card in any windows/linux/android/mac machine and to read/write files, directories aso. Writing raw data, without a file system will make that card usable only for an application which reads raw data from the card and that application must know what and where it is written.
I had few years ago a device which stored all data from a CAN bus onto a sd card in raw format. Then I placed the card in a PC and with an application which works directly with the card (such as hex workshop) I was able to read data from it. But the PC won't see such a card as a valid drive.
 

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