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Altera_Forum's avatar
Altera_Forum
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21 years ago

Reading the first sector of a CF card

I'm trying to read the first sector of a compact flash card. This is the boot sector and bpb of a fat filesystem. This sector has a lot of information about how the filesystem is(number of sector...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Hi

You are right. This is not the boot sector. From my experience, if you are using a FAT filesystem, you won't find the bpb at the actual first sectors. There are partition tables and other stuff before that. What I did was to read the first sectors until I found something that confirmed that this is the bpb, meaning the jumpBoot (starts with EB or E9) and also the last two bytes of the sector are 0x55 and 0xAA. I foudn the bpb at logical sector 32.

Nir