Problem in writing data into 2GB(Transend) SD card using FAT format

I am trying to write the (through out the day)events into the SD(2GB FAT format) card continuously.Some of the events are missing(i.e nearly one to six hours of event logs are missing out of 24 hours).And the log file is not not allowing to open in "append" mode or "write" mode.It is just allowing to open in read mode.

Can any body help me to sort out this problem.

From
Murali

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