tfc_say(" iobs=val: set IO block size value. Must not exceed %u bytes.", TFC_U(TFC_BLKSIZE));
tfc_say(" xtsblocks=val: use these nr of TF blocks per XTS block. Default is %u.", TFC_U(TFC_XTSBLOCKS));
tfc_say(" iseek=val: seek source file/device by these val bytes.");
tfc_say(" iobs=val: set IO block size value. Must not exceed %u bytes.", TFC_U(TFC_BLKSIZE));
tfc_say(" xtsblocks=val: use these nr of TF blocks per XTS block. Default is %u.", TFC_U(TFC_XTSBLOCKS));
tfc_say(" iseek=val: seek source file/device by these val bytes.");