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pblm reading FAT in larger partitions

pblm reading FAT in larger partitions

pblm reading FAT in larger partitions


iam trying to read FAT16 for an undelete(dos) utility iam orking on.iam working in C and my program works fine for smaller partitions(sectors per FAT<128 ie.less than 64k) and for floppies but hangs when i try to read sectors using int86x for spft>128 ;i dunno why.i thought that sufficient memory wasn't being allocated and i rectified that.now i dunno what might be the pblm.
books suggested i try ioctl generic fns to read/write sectors (int21h,440dh) but i dunno how to get the head no.
i really don't know what the pblm is and would be glad if someone could help.

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