SD card: merging mutiple bin file into one csv file with 2kB SRAM

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hi there,
i using sd card store data downloaded multiple independent datalogger. each datalogger store bin file on sd card. each bin file 30 kb.
but merge multiple bin file 1 csv file shared timestamps.
if had lot of sram create array containing data of each file , use create csv file.
but 2kb have segment operation.

my idea read byte 0 30 in each file, store in array , append data csv file. read data 31 60 of each file, , again.

so possible read 30 byte of data out of bin file stored on sd card?
which function should use that?

or have other suggestion make operation more efficient while staying within 2kb sram limit?

many in advance inputs!

i guess summarize question such:
"is there function allow me read 1 byte out of bin file, same same way can eeprom.read(736) example want read 736th byte of eeprom." ?


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